--- _id: '12790' abstract: - lang: eng text: Motivated by the recent discoveries of superconductivity in bilayer and trilayer graphene, we theoretically investigate superconductivity and other interaction-driven phases in multilayer graphene stacks. To this end, we study the density of states of multilayer graphene with up to four layers at the single-particle band structure level in the presence of a transverse electric field. Among the considered structures, tetralayer graphene with rhombohedral (ABCA) stacking reaches the highest density of states. We study the phases that can arise in ABCA graphene by tuning the carrier density and transverse electric field. For a broad region of the tuning parameters, the presence of strong Coulomb repulsion leads to a spontaneous spin and valley symmetry breaking via Stoner transitions. Using a model that incorporates the spontaneous spin and valley polarization, we explore the Kohn-Luttinger mechanism for superconductivity driven by repulsive Coulomb interactions. We find that the strongest superconducting instability is in the p-wave channel, and occurs in proximity to the onset of Stoner transitions. Interestingly, we find a range of densities and transverse electric fields where superconductivity develops out of a strongly corrugated, singly connected Fermi surface in each valley, leading to a topologically nontrivial chiral p+ip superconducting state with an even number of copropagating chiral Majorana edge modes. Our work establishes ABCA-stacked tetralayer graphene as a promising platform for observing strongly correlated physics and topological superconductivity. acknowledgement: E.B. and T.H. were supported by the European Research Council (ERC) under grant HQMAT (Grant Agreement No. 817799), by the Israel-USA Binational Science Foundation (BSF), and by a Research grant from Irving and Cherna Moskowitz. article_number: '104502' article_processing_charge: No article_type: original author: - first_name: Areg full_name: Ghazaryan, Areg id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87 last_name: Ghazaryan orcid: 0000-0001-9666-3543 - first_name: Tobias full_name: Holder, Tobias last_name: Holder - first_name: Erez full_name: Berg, Erez last_name: Berg - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Ghazaryan A, Holder T, Berg E, Serbyn M. Multilayer graphenes as a platform for interaction-driven physics and topological superconductivity. Physical Review B. 2023;107(10). doi:10.1103/PhysRevB.107.104502 apa: Ghazaryan, A., Holder, T., Berg, E., & Serbyn, M. (2023). Multilayer graphenes as a platform for interaction-driven physics and topological superconductivity. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.107.104502 chicago: Ghazaryan, Areg, Tobias Holder, Erez Berg, and Maksym Serbyn. “Multilayer Graphenes as a Platform for Interaction-Driven Physics and Topological Superconductivity.” Physical Review B. American Physical Society, 2023. https://doi.org/10.1103/PhysRevB.107.104502. ieee: A. Ghazaryan, T. Holder, E. Berg, and M. Serbyn, “Multilayer graphenes as a platform for interaction-driven physics and topological superconductivity,” Physical Review B, vol. 107, no. 10. American Physical Society, 2023. ista: Ghazaryan A, Holder T, Berg E, Serbyn M. 2023. Multilayer graphenes as a platform for interaction-driven physics and topological superconductivity. Physical Review B. 107(10), 104502. mla: Ghazaryan, Areg, et al. “Multilayer Graphenes as a Platform for Interaction-Driven Physics and Topological Superconductivity.” Physical Review B, vol. 107, no. 10, 104502, American Physical Society, 2023, doi:10.1103/PhysRevB.107.104502. short: A. Ghazaryan, T. Holder, E. Berg, M. Serbyn, Physical Review B 107 (2023). date_created: 2023-04-02T22:01:10Z date_published: 2023-03-01T00:00:00Z date_updated: 2023-08-01T13:59:29Z day: '01' department: - _id: MaSe - _id: MiLe doi: 10.1103/PhysRevB.107.104502 external_id: arxiv: - '2211.02492' isi: - '000945526400003' intvolume: ' 107' isi: 1 issue: '10' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2211.02492 month: '03' oa: 1 oa_version: Preprint publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: link: - description: News on the ISTA website relation: press_release url: https://ista.ac.at/en/news/reaching-superconductivity-layer-by-layer/ scopus_import: '1' status: public title: Multilayer graphenes as a platform for interaction-driven physics and topological superconductivity type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 107 year: '2023' ... --- _id: '12839' abstract: - lang: eng text: Universal nonequilibrium properties of isolated quantum systems are typically probed by studying transport of conserved quantities, such as charge or spin, while transport of energy has received considerably less attention. Here, we study infinite-temperature energy transport in the kinetically constrained PXP model describing Rydberg atom quantum simulators. Our state-of-the-art numerical simulations, including exact diagonalization and time-evolving block decimation methods, reveal the existence of two distinct transport regimes. At moderate times, the energy-energy correlation function displays periodic oscillations due to families of eigenstates forming different su(2) representations hidden within the spectrum. These families of eigenstates generalize the quantum many-body scarred states found in previous works and leave an imprint on the infinite-temperature energy transport. At later times, we observe a long-lived superdiffusive transport regime that we attribute to the proximity of a nearby integrable point. While generic strong deformations of the PXP model indeed restore diffusive transport, adding a strong chemical potential intriguingly gives rise to a well-converged superdiffusive exponent z≈3/2. Our results suggest constrained models to be potential hosts of novel transport regimes and call for developing an analytic understanding of their energy transport. acknowledgement: "We would like to thank Alexios Michailidis, Sarang Gopalakrishnan, and Achilleas Lazarides for useful comments. M. L. and M. S. acknowledge support by the European Research Council under the European Union’s Horizon 2020 research and innovation program (Grant\r\nAgreement No. 850899). J.-Y. D. and Z. P. acknowledge support by EPSRC Grant No. EP/R513258/1 and the Leverhulme Trust Research Leadership Grant No. RL2019-015. Statement of compliance with EPSRC policy framework on research data: This publication is theoretical work that does not require supporting research data. M. S., M. L., and Z. P. acknowledge support by the Erwin Schrödinger International Institute for Mathematics and\r\nPhysics. M. L. and M. S. acknowledge PRACE for awarding us access to Joliot-Curie at GENCI@CEA, France, where the TEBD simulations were performed. The TEBD\r\nsimulations were performed using the ITENSOR library [54]." article_number: '011033' article_processing_charge: No article_type: original author: - first_name: Marko full_name: Ljubotina, Marko id: F75EE9BE-5C90-11EA-905D-16643DDC885E last_name: Ljubotina - first_name: Jean Yves full_name: Desaules, Jean Yves last_name: Desaules - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Zlatko full_name: Papić, Zlatko last_name: Papić citation: ama: Ljubotina M, Desaules JY, Serbyn M, Papić Z. Superdiffusive energy transport in kinetically constrained models. Physical Review X. 2023;13(1). doi:10.1103/PhysRevX.13.011033 apa: Ljubotina, M., Desaules, J. Y., Serbyn, M., & Papić, Z. (2023). Superdiffusive energy transport in kinetically constrained models. Physical Review X. American Physical Society. https://doi.org/10.1103/PhysRevX.13.011033 chicago: Ljubotina, Marko, Jean Yves Desaules, Maksym Serbyn, and Zlatko Papić. “Superdiffusive Energy Transport in Kinetically Constrained Models.” Physical Review X. American Physical Society, 2023. https://doi.org/10.1103/PhysRevX.13.011033. ieee: M. Ljubotina, J. Y. Desaules, M. Serbyn, and Z. Papić, “Superdiffusive energy transport in kinetically constrained models,” Physical Review X, vol. 13, no. 1. American Physical Society, 2023. ista: Ljubotina M, Desaules JY, Serbyn M, Papić Z. 2023. Superdiffusive energy transport in kinetically constrained models. Physical Review X. 13(1), 011033. mla: Ljubotina, Marko, et al. “Superdiffusive Energy Transport in Kinetically Constrained Models.” Physical Review X, vol. 13, no. 1, 011033, American Physical Society, 2023, doi:10.1103/PhysRevX.13.011033. short: M. Ljubotina, J.Y. Desaules, M. Serbyn, Z. Papić, Physical Review X 13 (2023). date_created: 2023-04-16T22:01:09Z date_published: 2023-03-07T00:00:00Z date_updated: 2023-08-01T14:11:28Z day: '07' ddc: - '530' department: - _id: MaSe doi: 10.1103/PhysRevX.13.011033 ec_funded: 1 external_id: isi: - '000957625700001' file: - access_level: open_access checksum: ee060cea609af79bba7af74b1ce28078 content_type: application/pdf creator: dernst date_created: 2023-04-17T08:36:53Z date_updated: 2023-04-17T08:36:53Z file_id: '12845' file_name: 2023_PhysReviewX_Ljubotina.pdf file_size: 1958523 relation: main_file success: 1 file_date_updated: 2023-04-17T08:36:53Z has_accepted_license: '1' intvolume: ' 13' isi: 1 issue: '1' language: - iso: eng month: '03' oa: 1 oa_version: Published Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review X publication_identifier: eissn: - 2160-3308 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Superdiffusive energy transport in kinetically constrained models tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 13 year: '2023' ... --- _id: '13963' abstract: - lang: eng text: The many-body localization (MBL) proximity effect is an intriguing phenomenon where a thermal bath localizes due to the interaction with a disordered system. The interplay of thermal and nonergodic behavior in these systems gives rise to a rich phase diagram, whose exploration is an active field of research. In this paper, we study a bosonic Hubbard model featuring two particle species representing the bath and the disordered system. Using state-of-the-art numerical techniques, we investigate the dynamics of the model in different regimes, based on which we obtain a tentative phase diagram as a function of coupling strength and bath size. When the bath is composed of a single particle, we observe clear signatures of a transition from an MBL proximity effect to a delocalized phase. Increasing the bath size, however, its thermalizing effect becomes stronger and eventually the whole system delocalizes in the range of moderate interaction strengths studied. In this regime, we characterize particle transport, revealing diffusive behavior of the originally localized bosons. acknowledgement: "We thank A. A. Michailidis and A. Mirlin for insightful discussions. P.B., M.L., and M.S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). D.A. was\r\nsupported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 864597) and by the Swiss National Science Foundation. P.B., M.L., and M.S. acknowledge PRACE for awarding us access to Joliot-Curie at GENCI@CEA, France, where the TEBD simulations were performed. The TEBD simulations were performed using the ITensor library [60]." article_number: '054201' article_processing_charge: Yes (in subscription journal) article_type: original author: - first_name: Pietro full_name: Brighi, Pietro id: 4115AF5C-F248-11E8-B48F-1D18A9856A87 last_name: Brighi orcid: 0000-0002-7969-2729 - first_name: Marko full_name: Ljubotina, Marko id: F75EE9BE-5C90-11EA-905D-16643DDC885E last_name: Ljubotina - first_name: Dmitry A. full_name: Abanin, Dmitry A. last_name: Abanin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Brighi P, Ljubotina M, Abanin DA, Serbyn M. Many-body localization proximity effect in a two-species bosonic Hubbard model. Physical Review B. 2023;108(5). doi:10.1103/physrevb.108.054201 apa: Brighi, P., Ljubotina, M., Abanin, D. A., & Serbyn, M. (2023). Many-body localization proximity effect in a two-species bosonic Hubbard model. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.108.054201 chicago: Brighi, Pietro, Marko Ljubotina, Dmitry A. Abanin, and Maksym Serbyn. “Many-Body Localization Proximity Effect in a Two-Species Bosonic Hubbard Model.” Physical Review B. American Physical Society, 2023. https://doi.org/10.1103/physrevb.108.054201. ieee: P. Brighi, M. Ljubotina, D. A. Abanin, and M. Serbyn, “Many-body localization proximity effect in a two-species bosonic Hubbard model,” Physical Review B, vol. 108, no. 5. American Physical Society, 2023. ista: Brighi P, Ljubotina M, Abanin DA, Serbyn M. 2023. Many-body localization proximity effect in a two-species bosonic Hubbard model. Physical Review B. 108(5), 054201. mla: Brighi, Pietro, et al. “Many-Body Localization Proximity Effect in a Two-Species Bosonic Hubbard Model.” Physical Review B, vol. 108, no. 5, 054201, American Physical Society, 2023, doi:10.1103/physrevb.108.054201. short: P. Brighi, M. Ljubotina, D.A. Abanin, M. Serbyn, Physical Review B 108 (2023). date_created: 2023-08-05T18:25:22Z date_published: 2023-08-01T00:00:00Z date_updated: 2023-08-07T09:51:39Z day: '01' ddc: - '530' department: - _id: MaSe doi: 10.1103/physrevb.108.054201 ec_funded: 1 external_id: arxiv: - '2303.16876' file: - access_level: open_access checksum: f763000339b5fd543c14377109920690 content_type: application/pdf creator: dernst date_created: 2023-08-07T09:48:08Z date_updated: 2023-08-07T09:48:08Z file_id: '13981' file_name: 2023_PhysRevB_Brighi.pdf file_size: 3051398 relation: main_file success: 1 file_date_updated: 2023-08-07T09:48:08Z has_accepted_license: '1' intvolume: ' 108' issue: '5' language: - iso: eng month: '08' oa: 1 oa_version: Published Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Many-body localization proximity effect in a two-species bosonic Hubbard model tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 108 year: '2023' ... --- _id: '14320' abstract: - lang: eng text: The development of two-dimensional materials has resulted in a diverse range of novel, high-quality compounds with increasing complexity. A key requirement for a comprehensive quantitative theory is the accurate determination of these materials' band structure parameters. However, this task is challenging due to the intricate band structures and the indirect nature of experimental probes. In this work, we introduce a general framework to derive band structure parameters from experimental data using deep neural networks. We applied our method to the penetration field capacitance measurement of trilayer graphene, an effective probe of its density of states. First, we demonstrate that a trained deep network gives accurate predictions for the penetration field capacitance as a function of tight-binding parameters. Next, we use the fast and accurate predictions from the trained network to automatically determine tight-binding parameters directly from experimental data, with extracted parameters being in a good agreement with values in the literature. We conclude by discussing potential applications of our method to other materials and experimental techniques beyond penetration field capacitance. acknowledgement: A.F.Y. acknowledges primary support from the Department of Energy under award DE-SC0020043, and additional support from the Gordon and Betty Moore Foundation under award GBMF9471 for group operations. article_number: '125411' article_processing_charge: No article_type: original author: - first_name: Paul M full_name: Henderson, Paul M id: 13C09E74-18D9-11E9-8878-32CFE5697425 last_name: Henderson orcid: 0000-0002-5198-7445 - first_name: Areg full_name: Ghazaryan, Areg id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87 last_name: Ghazaryan orcid: 0000-0001-9666-3543 - first_name: Alexander A. full_name: Zibrov, Alexander A. last_name: Zibrov - first_name: Andrea F. full_name: Young, Andrea F. last_name: Young - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: 'Henderson PM, Ghazaryan A, Zibrov AA, Young AF, Serbyn M. Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene. Physical Review B. 2023;108(12). doi:10.1103/physrevb.108.125411' apa: 'Henderson, P. M., Ghazaryan, A., Zibrov, A. A., Young, A. F., & Serbyn, M. (2023). Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.108.125411' chicago: 'Henderson, Paul M, Areg Ghazaryan, Alexander A. Zibrov, Andrea F. Young, and Maksym Serbyn. “Deep Learning Extraction of Band Structure Parameters from Density of States: A Case Study on Trilayer Graphene.” Physical Review B. American Physical Society, 2023. https://doi.org/10.1103/physrevb.108.125411.' ieee: 'P. M. Henderson, A. Ghazaryan, A. A. Zibrov, A. F. Young, and M. Serbyn, “Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene,” Physical Review B, vol. 108, no. 12. American Physical Society, 2023.' ista: 'Henderson PM, Ghazaryan A, Zibrov AA, Young AF, Serbyn M. 2023. Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene. Physical Review B. 108(12), 125411.' mla: 'Henderson, Paul M., et al. “Deep Learning Extraction of Band Structure Parameters from Density of States: A Case Study on Trilayer Graphene.” Physical Review B, vol. 108, no. 12, 125411, American Physical Society, 2023, doi:10.1103/physrevb.108.125411.' short: P.M. Henderson, A. Ghazaryan, A.A. Zibrov, A.F. Young, M. Serbyn, Physical Review B 108 (2023). date_created: 2023-09-12T07:12:12Z date_published: 2023-09-15T00:00:00Z date_updated: 2023-09-20T09:38:24Z day: '15' department: - _id: MaSe - _id: ChLa - _id: MiLe doi: 10.1103/physrevb.108.125411 external_id: arxiv: - '2210.06310' intvolume: ' 108' issue: '12' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2210.06310 month: '09' oa: 1 oa_version: Preprint publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: 'Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene' type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 108 year: '2023' ... --- _id: '14334' abstract: - lang: eng text: Quantum kinetically constrained models have recently attracted significant attention due to their anomalous dynamics and thermalization. In this work, we introduce a hitherto unexplored family of kinetically constrained models featuring conserved particle number and strong inversion-symmetry breaking due to facilitated hopping. We demonstrate that these models provide a generic example of so-called quantum Hilbert space fragmentation, that is manifested in disconnected sectors in the Hilbert space that are not apparent in the computational basis. Quantum Hilbert space fragmentation leads to an exponential in system size number of eigenstates with exactly zero entanglement entropy across several bipartite cuts. These eigenstates can be probed dynamically using quenches from simple initial product states. In addition, we study the particle spreading under unitary dynamics launched from the domain wall state, and find faster than diffusive dynamics at high particle densities, that crosses over into logarithmically slow relaxation at smaller densities. Using a classically simulable cellular automaton, we reproduce the logarithmic dynamics observed in the quantum case. Our work suggests that particle conserving constrained models with inversion symmetry breaking realize so far unexplored dynamical behavior and invite their further theoretical and experimental studies. acknowledgement: "We would like to thank Raimel A. Medina, Hansveer Singh, and Dmitry Abanin for useful\r\ndiscussions.The authors acknowledge support by the European Research Council\r\n(ERC) under the European Union’s Horizon 2020 research and innovation program (Grant\r\nAgreement No. 850899). We acknowledge support by the Erwin Schrödinger International\r\nInstitute for Mathematics and Physics (ESI)." article_number: '093' article_processing_charge: No article_type: original author: - first_name: Pietro full_name: Brighi, Pietro id: 4115AF5C-F248-11E8-B48F-1D18A9856A87 last_name: Brighi orcid: 0000-0002-7969-2729 - first_name: Marko full_name: Ljubotina, Marko id: F75EE9BE-5C90-11EA-905D-16643DDC885E last_name: Ljubotina orcid: 0000-0003-0038-7068 - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Brighi P, Ljubotina M, Serbyn M. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. SciPost Physics. 2023;15(3). doi:10.21468/scipostphys.15.3.093 apa: Brighi, P., Ljubotina, M., & Serbyn, M. (2023). Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. SciPost Physics. SciPost Foundation. https://doi.org/10.21468/scipostphys.15.3.093 chicago: Brighi, Pietro, Marko Ljubotina, and Maksym Serbyn. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” SciPost Physics. SciPost Foundation, 2023. https://doi.org/10.21468/scipostphys.15.3.093. ieee: P. Brighi, M. Ljubotina, and M. Serbyn, “Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models,” SciPost Physics, vol. 15, no. 3. SciPost Foundation, 2023. ista: Brighi P, Ljubotina M, Serbyn M. 2023. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. SciPost Physics. 15(3), 093. mla: Brighi, Pietro, et al. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” SciPost Physics, vol. 15, no. 3, 093, SciPost Foundation, 2023, doi:10.21468/scipostphys.15.3.093. short: P. Brighi, M. Ljubotina, M. Serbyn, SciPost Physics 15 (2023). date_created: 2023-09-14T13:08:23Z date_published: 2023-09-13T00:00:00Z date_updated: 2023-09-20T10:46:29Z day: '13' ddc: - '530' department: - _id: MaSe doi: 10.21468/scipostphys.15.3.093 ec_funded: 1 external_id: arxiv: - '2210.15607' file: - access_level: open_access checksum: 4cef6a8021f6b6c47ab2f2f2b1387ac2 content_type: application/pdf creator: dernst date_created: 2023-09-20T10:46:10Z date_updated: 2023-09-20T10:46:10Z file_id: '14350' file_name: 2023_SciPostPhysics_Brighi.pdf file_size: 4866506 relation: main_file success: 1 file_date_updated: 2023-09-20T10:46:10Z has_accepted_license: '1' intvolume: ' 15' issue: '3' keyword: - General Physics and Astronomy language: - iso: eng month: '09' oa: 1 oa_version: Published Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: SciPost Physics publication_identifier: issn: - 2542-4653 publication_status: published publisher: SciPost Foundation quality_controlled: '1' related_material: record: - id: '12750' relation: earlier_version status: public status: public title: Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 15 year: '2023' ... --- _id: '13125' abstract: - lang: eng text: 'The quantum approximate optimization algorithm (QAOA) is a variational quantum algorithm, where a quantum computer implements a variational ansatz consisting of p layers of alternating unitary operators and a classical computer is used to optimize the variational parameters. For a random initialization, the optimization typically leads to local minima with poor performance, motivating the search for initialization strategies of QAOA variational parameters. Although numerous heuristic initializations exist, an analytical understanding and performance guarantees for large p remain evasive.We introduce a greedy initialization of QAOA which guarantees improving performance with an increasing number of layers. Our main result is an analytic construction of 2p + 1 transition states—saddle points with a unique negative curvature direction—for QAOA with p + 1 layers that use the local minimum of QAOA with p layers. Transition states connect to new local minima, which are guaranteed to lower the energy compared to the minimum found for p layers. We use the GREEDY procedure to navigate the exponentially increasing with p number of local minima resulting from the recursive application of our analytic construction. The performance of the GREEDY procedure matches available initialization strategies while providing a guarantee for the minimal energy to decrease with an increasing number of layers p. ' acknowledgement: 'We thank V. Verteletskyi for a joint collaboration on numerical studies of the QAOA during his internship at ISTA that inspired analytic results on TS reported in this work. We acknowledge A. A. Mele and M. Brooks for discussions and D. Egger, P. Love, and D. Wierichs for valuable feedback on the manuscript. S.H.S., R.A.M., and M.S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). R.K. is supported by the SFB BeyondC (Grant No. F7107-N38) and the project QuantumReady (FFG 896217). ' article_number: '062404' article_processing_charge: No article_type: original author: - first_name: Stefan full_name: Sack, Stefan id: dd622248-f6e0-11ea-865d-ce382a1c81a5 last_name: Sack orcid: 0000-0001-5400-8508 - first_name: Raimel A full_name: Medina Ramos, Raimel A id: CE680B90-D85A-11E9-B684-C920E6697425 last_name: Medina Ramos orcid: 0000-0002-5383-2869 - first_name: Richard full_name: Kueng, Richard last_name: Kueng - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Sack S, Medina Ramos RA, Kueng R, Serbyn M. Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. Physical Review A. 2023;107(6). doi:10.1103/physreva.107.062404 apa: Sack, S., Medina Ramos, R. A., Kueng, R., & Serbyn, M. (2023). Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. Physical Review A. American Physical Society. https://doi.org/10.1103/physreva.107.062404 chicago: Sack, Stefan, Raimel A Medina Ramos, Richard Kueng, and Maksym Serbyn. “Recursive Greedy Initialization of the Quantum Approximate Optimization Algorithm with Guaranteed Improvement.” Physical Review A. American Physical Society, 2023. https://doi.org/10.1103/physreva.107.062404. ieee: S. Sack, R. A. Medina Ramos, R. Kueng, and M. Serbyn, “Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement,” Physical Review A, vol. 107, no. 6. American Physical Society, 2023. ista: Sack S, Medina Ramos RA, Kueng R, Serbyn M. 2023. Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. Physical Review A. 107(6), 062404. mla: Sack, Stefan, et al. “Recursive Greedy Initialization of the Quantum Approximate Optimization Algorithm with Guaranteed Improvement.” Physical Review A, vol. 107, no. 6, 062404, American Physical Society, 2023, doi:10.1103/physreva.107.062404. short: S. Sack, R.A. Medina Ramos, R. Kueng, M. Serbyn, Physical Review A 107 (2023). date_created: 2023-06-07T06:57:32Z date_published: 2023-06-02T00:00:00Z date_updated: 2023-12-13T14:47:25Z day: '02' ddc: - '530' department: - _id: MaSe doi: 10.1103/physreva.107.062404 ec_funded: 1 external_id: arxiv: - '2209.01159' isi: - '001016927100012' file: - access_level: open_access checksum: 0d71423888eeccaa60d8f41197f26306 content_type: application/pdf creator: dernst date_created: 2023-06-13T07:28:36Z date_updated: 2023-06-13T07:28:36Z file_id: '13131' file_name: 2023_PhysRevA_Sack.pdf file_size: 2524611 relation: main_file success: 1 file_date_updated: 2023-06-13T07:28:36Z has_accepted_license: '1' intvolume: ' 107' isi: 1 issue: '6' language: - iso: eng month: '06' oa: 1 oa_version: Published Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: record: - id: '14622' relation: dissertation_contains status: public scopus_import: '1' status: public title: Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 107 year: '2023' ... --- _id: '12276' abstract: - lang: eng text: Ongoing development of quantum simulators allows for a progressively finer degree of control of quantum many-body systems. This motivates the development of efficient approaches to facilitate the control of such systems and enable the preparation of nontrivial quantum states. Here we formulate an approach to control quantum systems based on matrix product states (MPSs). We compare counterdiabatic and leakage minimization approaches to the so-called local steering problem that consists in finding the best value of the control parameters for generating a unitary evolution of the specific MPS in a given direction. In order to benchmark the different approaches, we apply them to the generalization of the PXP model known to exhibit coherent quantum dynamics due to quantum many-body scars. We find that the leakage-based approach generally outperforms the counterdiabatic framework and use it to construct a Floquet model with quantum scars. We perform the first steps towards global trajectory optimization and demonstrate entanglement steering capabilities in the generalized PXP model. Finally, we apply our leakage minimization approach to construct quantum scars in the periodically driven nonintegrable Ising model. acknowledgement: We thank A. A. Michailidis for insightful discussions. M.L. and M.S. acknowledge support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 850899). D.A. is supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 864597) and by the Swiss National Science Foundation. The infinite TEBD simulations were performed using the ITensor library [67]. article_number: '030343' article_processing_charge: No article_type: original author: - first_name: Marko full_name: Ljubotina, Marko id: F75EE9BE-5C90-11EA-905D-16643DDC885E last_name: Ljubotina - first_name: Barbara full_name: Roos, Barbara id: 5DA90512-D80F-11E9-8994-2E2EE6697425 last_name: Roos orcid: 0000-0002-9071-5880 - first_name: Dmitry A. full_name: Abanin, Dmitry A. last_name: Abanin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Ljubotina M, Roos B, Abanin DA, Serbyn M. Optimal steering of matrix product states and quantum many-body scars. PRX Quantum. 2022;3(3). doi:10.1103/prxquantum.3.030343 apa: Ljubotina, M., Roos, B., Abanin, D. A., & Serbyn, M. (2022). Optimal steering of matrix product states and quantum many-body scars. PRX Quantum. American Physical Society. https://doi.org/10.1103/prxquantum.3.030343 chicago: Ljubotina, Marko, Barbara Roos, Dmitry A. Abanin, and Maksym Serbyn. “Optimal Steering of Matrix Product States and Quantum Many-Body Scars.” PRX Quantum. American Physical Society, 2022. https://doi.org/10.1103/prxquantum.3.030343. ieee: M. Ljubotina, B. Roos, D. A. Abanin, and M. Serbyn, “Optimal steering of matrix product states and quantum many-body scars,” PRX Quantum, vol. 3, no. 3. American Physical Society, 2022. ista: Ljubotina M, Roos B, Abanin DA, Serbyn M. 2022. Optimal steering of matrix product states and quantum many-body scars. PRX Quantum. 3(3), 030343. mla: Ljubotina, Marko, et al. “Optimal Steering of Matrix Product States and Quantum Many-Body Scars.” PRX Quantum, vol. 3, no. 3, 030343, American Physical Society, 2022, doi:10.1103/prxquantum.3.030343. short: M. Ljubotina, B. Roos, D.A. Abanin, M. Serbyn, PRX Quantum 3 (2022). date_created: 2023-01-16T10:01:56Z date_published: 2022-09-23T00:00:00Z date_updated: 2023-01-30T11:05:23Z day: '23' ddc: - '530' department: - _id: MaSe - _id: RoSe doi: 10.1103/prxquantum.3.030343 ec_funded: 1 external_id: arxiv: - '2204.02899' file: - access_level: open_access checksum: ef8f0a1b5a019b3958009162de0fa4c3 content_type: application/pdf creator: dernst date_created: 2023-01-30T11:02:50Z date_updated: 2023-01-30T11:02:50Z file_id: '12457' file_name: 2022_PRXQuantum_Ljubotina.pdf file_size: 7661905 relation: main_file success: 1 file_date_updated: 2023-01-30T11:02:50Z has_accepted_license: '1' intvolume: ' 3' issue: '3' keyword: - General Medicine language: - iso: eng month: '09' oa: 1 oa_version: Published Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: PRX Quantum publication_identifier: eissn: - 2691-3399 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Optimal steering of matrix product states and quantum many-body scars tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 3 year: '2022' ... --- _id: '10863' abstract: - lang: eng text: 'Nonlinear optical responses are commonly used as a probe for studying the electronic properties of materials. For topological materials, studies thus far focused on photogalvanic electric currents, which are forbidden in centrosymmetric materials because they require broken inversion symmetry. In this Letter, we propose a class of symmetry-allowed responses for inversion-symmetric topological insulators with two doubly degenerate bands. We consider a specific example of such a response, the orbital current, and show that the sign of the response reflects the Z2 topological index, i.e., the orbital current changes sign at the transition between trivial and topological insulator phases. This is illustrated in two models of topological insulators: the Bernevig-Hughes-Zhang model and the 1T′ phase of transition metal dichalcogenides.' acknowledgement: "We are grateful to Takahiro Morimoto and Zhanybek Alpichshev for fruitful discussions. MD was supported by Austrian Agency for International Cooperation in Education and Research (OeAD-GmbH) and by the John Seo Fellowship at MIT. HI was supported by JSPS KAKENHI Grant Numbers JP19K14649 and JP18H03676, and by UTokyo Global Activity Support Program for\r\nYoung Researchers." article_number: L121407 article_processing_charge: No article_type: letter_note author: - first_name: Margarita full_name: Davydova, Margarita last_name: Davydova - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Hiroaki full_name: Ishizuka, Hiroaki last_name: Ishizuka citation: ama: Davydova M, Serbyn M, Ishizuka H. Symmetry-allowed nonlinear orbital response across the topological phase transition in centrosymmetric materials. Physical Review B. 2022;105. doi:10.1103/PhysRevB.105.L121407 apa: Davydova, M., Serbyn, M., & Ishizuka, H. (2022). Symmetry-allowed nonlinear orbital response across the topological phase transition in centrosymmetric materials. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.105.L121407 chicago: Davydova, Margarita, Maksym Serbyn, and Hiroaki Ishizuka. “Symmetry-Allowed Nonlinear Orbital Response across the Topological Phase Transition in Centrosymmetric Materials.” Physical Review B. American Physical Society, 2022. https://doi.org/10.1103/PhysRevB.105.L121407. ieee: M. Davydova, M. Serbyn, and H. Ishizuka, “Symmetry-allowed nonlinear orbital response across the topological phase transition in centrosymmetric materials,” Physical Review B, vol. 105. American Physical Society, 2022. ista: Davydova M, Serbyn M, Ishizuka H. 2022. Symmetry-allowed nonlinear orbital response across the topological phase transition in centrosymmetric materials. Physical Review B. 105, L121407. mla: Davydova, Margarita, et al. “Symmetry-Allowed Nonlinear Orbital Response across the Topological Phase Transition in Centrosymmetric Materials.” Physical Review B, vol. 105, L121407, American Physical Society, 2022, doi:10.1103/PhysRevB.105.L121407. short: M. Davydova, M. Serbyn, H. Ishizuka, Physical Review B 105 (2022). date_created: 2022-03-18T10:20:46Z date_published: 2022-03-17T00:00:00Z date_updated: 2023-08-03T06:09:56Z day: '17' department: - _id: MaSe doi: 10.1103/PhysRevB.105.L121407 external_id: arxiv: - '2101.08277' isi: - '000800752500001' intvolume: ' 105' isi: 1 language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2101.08277 month: '03' oa: 1 oa_version: Preprint publication: Physical Review B publication_identifier: issn: - 2469-9969 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Symmetry-allowed nonlinear orbital response across the topological phase transition in centrosymmetric materials type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 105 year: '2022' ... --- _id: '11337' abstract: - lang: eng text: 'Nonanalytic points in the return probability of a quantum state as a function of time, known as dynamical quantum phase transitions (DQPTs), have received great attention in recent years, but the understanding of their mechanism is still incomplete. In our recent work [Phys. Rev. Lett. 126, 040602 (2021)], we demonstrated that one-dimensional DQPTs can be produced by two distinct mechanisms, namely semiclassical precession and entanglement generation, leading to the definition of precession (pDQPTs) and entanglement (eDQPTs) dynamical quantum phase transitions. In this manuscript, we extend and investigate the notion of p- and eDQPTs in two-dimensional systems by considering semi-infinite ladders of varying width. For square lattices, we find that pDQPTs and eDQPTs persist and are characterized by similar phenomenology as in 1D: pDQPTs are associated with a magnetization sign change and a wide entanglement gap, while eDQPTs correspond to suppressed local observables and avoided crossings in the entanglement spectrum. However, DQPTs show higher sensitivity to the ladder width and other details, challenging the extrapolation to the thermodynamic limit especially for eDQPTs. Moving to honeycomb lattices, we also demonstrate that lattices with an odd number of nearest neighbors give rise to phenomenologies beyond the one-dimensional classification.' acknowledgement: "We acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 850899).\r\nS.D.N. also acknowledges funding from the Institute of Science and Technology (IST) Austria, and from the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Skłodowska-Curie Grant Agreement No. 754411." article_number: '165149' article_processing_charge: No article_type: original author: - first_name: Stefano full_name: De Nicola, Stefano id: 42832B76-F248-11E8-B48F-1D18A9856A87 last_name: De Nicola orcid: 0000-0002-4842-6671 - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: De Nicola S, Michailidis A, Serbyn M. Entanglement and precession in two-dimensional dynamical quantum phase transitions. Physical Review B. 2022;105. doi:10.1103/PhysRevB.105.165149 apa: De Nicola, S., Michailidis, A., & Serbyn, M. (2022). Entanglement and precession in two-dimensional dynamical quantum phase transitions. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.105.165149 chicago: De Nicola, Stefano, Alexios Michailidis, and Maksym Serbyn. “Entanglement and Precession in Two-Dimensional Dynamical Quantum Phase Transitions.” Physical Review B. American Physical Society, 2022. https://doi.org/10.1103/PhysRevB.105.165149. ieee: S. De Nicola, A. Michailidis, and M. Serbyn, “Entanglement and precession in two-dimensional dynamical quantum phase transitions,” Physical Review B, vol. 105. American Physical Society, 2022. ista: De Nicola S, Michailidis A, Serbyn M. 2022. Entanglement and precession in two-dimensional dynamical quantum phase transitions. Physical Review B. 105, 165149. mla: De Nicola, Stefano, et al. “Entanglement and Precession in Two-Dimensional Dynamical Quantum Phase Transitions.” Physical Review B, vol. 105, 165149, American Physical Society, 2022, doi:10.1103/PhysRevB.105.165149. short: S. De Nicola, A. Michailidis, M. Serbyn, Physical Review B 105 (2022). date_created: 2022-04-28T08:06:10Z date_published: 2022-04-15T00:00:00Z date_updated: 2023-08-03T06:33:33Z day: '15' department: - _id: MaSe doi: 10.1103/PhysRevB.105.165149 ec_funded: 1 external_id: arxiv: - '2112.11273' isi: - '000806812400004' intvolume: ' 105' isi: 1 language: - iso: eng main_file_link: - open_access: '1' url: ' https://doi.org/10.48550/arXiv.2112.11273' month: '04' oa: 1 oa_version: Preprint project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' - _id: 260C2330-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '754411' name: ISTplus - Postdoctoral Fellowships publication: Physical Review B publication_identifier: eisbn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Entanglement and precession in two-dimensional dynamical quantum phase transitions type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 105 year: '2022' ... --- _id: '11379' abstract: - lang: eng text: Bernal-stacked multilayer graphene is a versatile platform to explore quantum transport phenomena and interaction physics due to its exceptional tunability via electrostatic gating. For instance, upon applying a perpendicular electric field, its band structure exhibits several off-center Dirac points (so-called Dirac gullies) in each valley. Here, the formation of Dirac gullies and the interaction-induced breakdown of gully coherence is explored via magnetotransport measurements in high-quality Bernal-stacked (ABA) trilayer graphene. At zero magnetic field, multiple Lifshitz transitions indicating the formation of Dirac gullies are identified. In the quantum Hall regime, the emergence of Dirac gullies is evident as an increase in Landau level degeneracy. When tuning both electric and magnetic fields, electron–electron interactions can be controllably enhanced until, beyond critical electric and magnetic fields, the gully degeneracy is eventually lifted. The arising correlated ground state is consistent with a previously predicted nematic phase that spontaneously breaks the rotational gully symmetry. acknowledgement: "We acknowledge funding from the Center for Nanoscience (CeNS) and by the Deutsche\r\nForschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy-EXC-2111-390814868 (MCQST). K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan (Grant Number PMXP0112101001) and JSPS KAKENHI (Grant Numbers 19H05790 and JP20H00354)." article_processing_charge: No article_type: original author: - first_name: Felix full_name: Winterer, Felix last_name: Winterer - first_name: Anna M. full_name: Seiler, Anna M. last_name: Seiler - first_name: Areg full_name: Ghazaryan, Areg id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87 last_name: Ghazaryan orcid: 0000-0001-9666-3543 - first_name: Fabian R. full_name: Geisenhof, Fabian R. last_name: Geisenhof - first_name: Kenji full_name: Watanabe, Kenji last_name: Watanabe - first_name: Takashi full_name: Taniguchi, Takashi last_name: Taniguchi - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: R. Thomas full_name: Weitz, R. Thomas last_name: Weitz citation: ama: Winterer F, Seiler AM, Ghazaryan A, et al. Spontaneous gully-polarized quantum hall states in ABA trilayer graphene. Nano Letters. 2022;22(8):3317-3322. doi:10.1021/acs.nanolett.2c00435 apa: Winterer, F., Seiler, A. M., Ghazaryan, A., Geisenhof, F. R., Watanabe, K., Taniguchi, T., … Weitz, R. T. (2022). Spontaneous gully-polarized quantum hall states in ABA trilayer graphene. Nano Letters. American Chemical Society. https://doi.org/10.1021/acs.nanolett.2c00435 chicago: Winterer, Felix, Anna M. Seiler, Areg Ghazaryan, Fabian R. Geisenhof, Kenji Watanabe, Takashi Taniguchi, Maksym Serbyn, and R. Thomas Weitz. “Spontaneous Gully-Polarized Quantum Hall States in ABA Trilayer Graphene.” Nano Letters. American Chemical Society, 2022. https://doi.org/10.1021/acs.nanolett.2c00435. ieee: F. Winterer et al., “Spontaneous gully-polarized quantum hall states in ABA trilayer graphene,” Nano Letters, vol. 22, no. 8. American Chemical Society, pp. 3317–3322, 2022. ista: Winterer F, Seiler AM, Ghazaryan A, Geisenhof FR, Watanabe K, Taniguchi T, Serbyn M, Weitz RT. 2022. Spontaneous gully-polarized quantum hall states in ABA trilayer graphene. Nano Letters. 22(8), 3317–3322. mla: Winterer, Felix, et al. “Spontaneous Gully-Polarized Quantum Hall States in ABA Trilayer Graphene.” Nano Letters, vol. 22, no. 8, American Chemical Society, 2022, pp. 3317–22, doi:10.1021/acs.nanolett.2c00435. short: F. Winterer, A.M. Seiler, A. Ghazaryan, F.R. Geisenhof, K. Watanabe, T. Taniguchi, M. Serbyn, R.T. Weitz, Nano Letters 22 (2022) 3317–3322. date_created: 2022-05-15T22:01:41Z date_published: 2022-04-27T00:00:00Z date_updated: 2023-08-03T07:12:45Z day: '27' department: - _id: MaSe doi: 10.1021/acs.nanolett.2c00435 external_id: arxiv: - '2109.00556' isi: - '000809056900019' intvolume: ' 22' isi: 1 issue: '8' language: - iso: eng main_file_link: - open_access: '1' url: ' https://doi.org/10.48550/arXiv.2109.00556' month: '04' oa: 1 oa_version: Preprint page: 3317-3322 publication: Nano Letters publication_identifier: eissn: - '15306992' issn: - '15306984' publication_status: published publisher: American Chemical Society quality_controlled: '1' scopus_import: '1' status: public title: Spontaneous gully-polarized quantum hall states in ABA trilayer graphene type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 22 year: '2022' ... --- _id: '11470' abstract: - lang: eng text: Many-body localization (MBL) is an example of a dynamical phase of matter that avoids thermalization. While the MBL phase is robust to weak local perturbations, the fate of an MBL system coupled to a thermalizing quantum system that represents a “heat bath” is an open question that is actively investigated theoretically and experimentally. In this work, we consider the stability of an Anderson insulator with a finite density of particles interacting with a single mobile impurity—a small quantum bath. We give perturbative arguments that support the stability of localization in the strong interaction regime. Large-scale tensor network simulations of dynamics are employed to corroborate the presence of the localized phase and give quantitative predictions in the thermodynamic limit. We develop a phenomenological description of the dynamics in the strong interaction regime, and we demonstrate that the impurity effectively turns the Anderson insulator into an MBL phase, giving rise to nontrivial entanglement dynamics well captured by our phenomenology. acknowledged_ssus: - _id: ScienComp acknowledgement: We acknowledge useful discussions with M. Ljubotina. P. B., A. M., and M. S. were supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). D.A. was supported by the Swiss National Science Foundation and by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 864597). The development of parallel TEBD code was was supported by S. Elefante from the Scientific Computing (SciComp) that is part of Scientific Service Units (SSU) of IST Austria. Some of the computations were performed on the Baobab cluster of the University of Geneva. article_number: L220203 article_processing_charge: No article_type: original author: - first_name: Pietro full_name: Brighi, Pietro id: 4115AF5C-F248-11E8-B48F-1D18A9856A87 last_name: Brighi orcid: 0000-0002-7969-2729 - first_name: Alexios A. full_name: Michailidis, Alexios A. last_name: Michailidis - first_name: Dmitry A. full_name: Abanin, Dmitry A. last_name: Abanin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Brighi P, Michailidis AA, Abanin DA, Serbyn M. Propagation of many-body localization in an Anderson insulator. Physical Review B. 2022;105(22). doi:10.1103/physrevb.105.l220203 apa: Brighi, P., Michailidis, A. A., Abanin, D. A., & Serbyn, M. (2022). Propagation of many-body localization in an Anderson insulator. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.105.l220203 chicago: Brighi, Pietro, Alexios A. Michailidis, Dmitry A. Abanin, and Maksym Serbyn. “Propagation of Many-Body Localization in an Anderson Insulator.” Physical Review B. American Physical Society, 2022. https://doi.org/10.1103/physrevb.105.l220203. ieee: P. Brighi, A. A. Michailidis, D. A. Abanin, and M. Serbyn, “Propagation of many-body localization in an Anderson insulator,” Physical Review B, vol. 105, no. 22. American Physical Society, 2022. ista: Brighi P, Michailidis AA, Abanin DA, Serbyn M. 2022. Propagation of many-body localization in an Anderson insulator. Physical Review B. 105(22), L220203. mla: Brighi, Pietro, et al. “Propagation of Many-Body Localization in an Anderson Insulator.” Physical Review B, vol. 105, no. 22, L220203, American Physical Society, 2022, doi:10.1103/physrevb.105.l220203. short: P. Brighi, A.A. Michailidis, D.A. Abanin, M. Serbyn, Physical Review B 105 (2022). date_created: 2022-06-29T20:20:47Z date_published: 2022-06-27T00:00:00Z date_updated: 2023-08-03T07:23:52Z day: '27' department: - _id: MaSe doi: 10.1103/physrevb.105.l220203 ec_funded: 1 external_id: arxiv: - '2109.07332' isi: - '000823050000012' intvolume: ' 105' isi: 1 issue: '22' language: - iso: eng main_file_link: - open_access: '1' url: ' https://doi.org/10.48550/arXiv.2109.07332' month: '06' oa: 1 oa_version: Preprint project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: record: - id: '12732' relation: dissertation_contains status: public status: public title: Propagation of many-body localization in an Anderson insulator type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 105 year: '2022' ... --- _id: '12259' abstract: - lang: eng text: 'Theoretical foundations of chaos have been predominantly laid out for finite-dimensional dynamical systems, such as the three-body problem in classical mechanics and the Lorenz model in dissipative systems. In contrast, many real-world chaotic phenomena, e.g., weather, arise in systems with many (formally infinite) degrees of freedom, which limits direct quantitative analysis of such systems using chaos theory. In the present work, we demonstrate that the hydrodynamic pilot-wave systems offer a bridge between low- and high-dimensional chaotic phenomena by allowing for a systematic study of how the former connects to the latter. Specifically, we present experimental results, which show the formation of low-dimensional chaotic attractors upon destabilization of regular dynamics and a final transition to high-dimensional chaos via the merging of distinct chaotic regions through a crisis bifurcation. Moreover, we show that the post-crisis dynamics of the system can be rationalized as consecutive scatterings from the nonattracting chaotic sets with lifetimes following exponential distributions. ' acknowledgement: 'This work was partially funded by the Institute of Science and Technology Austria Interdisciplinary Project Committee Grant “Pilot-Wave Hydrodynamics: Chaos and Quantum Analogies.”' article_number: '093138' article_processing_charge: No article_type: original author: - first_name: George H full_name: Choueiri, George H id: 448BD5BC-F248-11E8-B48F-1D18A9856A87 last_name: Choueiri - first_name: Balachandra full_name: Suri, Balachandra id: 47A5E706-F248-11E8-B48F-1D18A9856A87 last_name: Suri - first_name: Jack full_name: Merrin, Jack id: 4515C308-F248-11E8-B48F-1D18A9856A87 last_name: Merrin orcid: 0000-0001-5145-4609 - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Björn full_name: Hof, Björn id: 3A374330-F248-11E8-B48F-1D18A9856A87 last_name: Hof orcid: 0000-0003-2057-2754 - first_name: Nazmi B full_name: Budanur, Nazmi B id: 3EA1010E-F248-11E8-B48F-1D18A9856A87 last_name: Budanur orcid: 0000-0003-0423-5010 citation: ama: 'Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. Crises and chaotic scattering in hydrodynamic pilot-wave experiments. Chaos: An Interdisciplinary Journal of Nonlinear Science. 2022;32(9). doi:10.1063/5.0102904' apa: 'Choueiri, G. H., Suri, B., Merrin, J., Serbyn, M., Hof, B., & Budanur, N. B. (2022). Crises and chaotic scattering in hydrodynamic pilot-wave experiments. Chaos: An Interdisciplinary Journal of Nonlinear Science. AIP Publishing. https://doi.org/10.1063/5.0102904' chicago: 'Choueiri, George H, Balachandra Suri, Jack Merrin, Maksym Serbyn, Björn Hof, and Nazmi B Budanur. “Crises and Chaotic Scattering in Hydrodynamic Pilot-Wave Experiments.” Chaos: An Interdisciplinary Journal of Nonlinear Science. AIP Publishing, 2022. https://doi.org/10.1063/5.0102904.' ieee: 'G. H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, and N. B. Budanur, “Crises and chaotic scattering in hydrodynamic pilot-wave experiments,” Chaos: An Interdisciplinary Journal of Nonlinear Science, vol. 32, no. 9. AIP Publishing, 2022.' ista: 'Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. 2022. Crises and chaotic scattering in hydrodynamic pilot-wave experiments. Chaos: An Interdisciplinary Journal of Nonlinear Science. 32(9), 093138.' mla: 'Choueiri, George H., et al. “Crises and Chaotic Scattering in Hydrodynamic Pilot-Wave Experiments.” Chaos: An Interdisciplinary Journal of Nonlinear Science, vol. 32, no. 9, 093138, AIP Publishing, 2022, doi:10.1063/5.0102904.' short: 'G.H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, N.B. Budanur, Chaos: An Interdisciplinary Journal of Nonlinear Science 32 (2022).' date_created: 2023-01-16T09:58:16Z date_published: 2022-09-26T00:00:00Z date_updated: 2023-08-04T09:51:17Z day: '26' ddc: - '530' department: - _id: MaSe - _id: BjHo - _id: NanoFab doi: 10.1063/5.0102904 external_id: arxiv: - '2206.01531' isi: - '000861009600005' file: - access_level: open_access checksum: 17881eff8b21969359a2dd64620120ba content_type: application/pdf creator: dernst date_created: 2023-01-30T09:41:12Z date_updated: 2023-01-30T09:41:12Z file_id: '12445' file_name: 2022_Chaos_Choueiri.pdf file_size: 3209644 relation: main_file success: 1 file_date_updated: 2023-01-30T09:41:12Z has_accepted_license: '1' intvolume: ' 32' isi: 1 issue: '9' keyword: - Applied Mathematics - General Physics and Astronomy - Mathematical Physics - Statistical and Nonlinear Physics language: - iso: eng month: '09' oa: 1 oa_version: Published Version publication: 'Chaos: An Interdisciplinary Journal of Nonlinear Science' publication_identifier: eissn: - 1089-7682 issn: - 1054-1500 publication_status: published publisher: AIP Publishing quality_controlled: '1' scopus_import: '1' status: public title: Crises and chaotic scattering in hydrodynamic pilot-wave experiments tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 32 year: '2022' ... --- _id: '11469' abstract: - lang: eng text: Thermalizing and localized many-body quantum systems present two distinct dynamical phases of matter. Recently the fate of a localized system coupled to a thermalizing system viewed as a quantum bath received significant theoretical and experimental attention. In this work, we study a mobile impurity, representing a small quantum bath, that interacts locally with an Anderson insulator with a finite density of localized particles. Using static Hartree approximation to obtain an effective disorder strength, we formulate an analytic criterion for the perturbative stability of the localization. Next, we use an approximate dynamical Hartree method and the quasi-exact time-evolved block decimation (TEBD) algorithm to study the dynamics of the system. We find that the dynamical Hartree approach which completely ignores entanglement between the impurity and localized particles predicts the delocalization of the system. In contrast, the full numerical simulation of the unitary dynamics with TEBD suggests the stability of localization on numerically accessible timescales. Finally, using an extension of the density matrix renormalization group algorithm to excited states (DMRG-X), we approximate the highly excited eigenstates of the system. We find that the impurity remains localized in the eigenstates and entanglement is enhanced in a finite region around the position of the impurity, confirming the dynamical predictions. Dynamics and the DMRG-X results provide compelling evidence for the stability of localization. acknowledged_ssus: - _id: ScienComp acknowledgement: We thank M. Ljubotina for insightful discussions. P. B., A. M. and M. S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). D. A. was supported by the Swiss National Science Foundation and by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 864597). The development of parallel TEBD code was supported by S. Elefante from the Scientific Computing (SciComp) that is part of Scientific Service Units (SSU) of IST Austria. Some of the computations were performed on the Baobab cluster of the University of Geneva. article_number: '224208' article_processing_charge: No article_type: original author: - first_name: Pietro full_name: Brighi, Pietro id: 4115AF5C-F248-11E8-B48F-1D18A9856A87 last_name: Brighi orcid: 0000-0002-7969-2729 - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis orcid: 0000-0002-8443-1064 - first_name: Kristina full_name: Kirova, Kristina id: 4aeda2ae-f847-11ec-98e0-c4a66fe174d4 last_name: Kirova - first_name: Dmitry A. full_name: Abanin, Dmitry A. last_name: Abanin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Brighi P, Michailidis A, Kirova K, Abanin DA, Serbyn M. Localization of a mobile impurity interacting with an Anderson insulator. Physical Review B. 2022;105(22). doi:10.1103/physrevb.105.224208 apa: Brighi, P., Michailidis, A., Kirova, K., Abanin, D. A., & Serbyn, M. (2022). Localization of a mobile impurity interacting with an Anderson insulator. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.105.224208 chicago: Brighi, Pietro, Alexios Michailidis, Kristina Kirova, Dmitry A. Abanin, and Maksym Serbyn. “Localization of a Mobile Impurity Interacting with an Anderson Insulator.” Physical Review B. American Physical Society, 2022. https://doi.org/10.1103/physrevb.105.224208. ieee: P. Brighi, A. Michailidis, K. Kirova, D. A. Abanin, and M. Serbyn, “Localization of a mobile impurity interacting with an Anderson insulator,” Physical Review B, vol. 105, no. 22. American Physical Society, 2022. ista: Brighi P, Michailidis A, Kirova K, Abanin DA, Serbyn M. 2022. Localization of a mobile impurity interacting with an Anderson insulator. Physical Review B. 105(22), 224208. mla: Brighi, Pietro, et al. “Localization of a Mobile Impurity Interacting with an Anderson Insulator.” Physical Review B, vol. 105, no. 22, 224208, American Physical Society, 2022, doi:10.1103/physrevb.105.224208. short: P. Brighi, A. Michailidis, K. Kirova, D.A. Abanin, M. Serbyn, Physical Review B 105 (2022). date_created: 2022-06-29T20:19:51Z date_published: 2022-06-27T00:00:00Z date_updated: 2023-09-05T12:12:52Z day: '27' department: - _id: MaSe doi: 10.1103/physrevb.105.224208 ec_funded: 1 external_id: arxiv: - '2111.08603' isi: - '000823050000001' intvolume: ' 105' isi: 1 issue: '22' language: - iso: eng main_file_link: - open_access: '1' url: ' https://doi.org/10.48550/arXiv.2111.08603 Focus to learn more' month: '06' oa: 1 oa_version: Preprint project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: record: - id: '12732' relation: dissertation_contains status: public status: public title: Localization of a mobile impurity interacting with an Anderson insulator type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 105 year: '2022' ... --- _id: '12750' abstract: - lang: eng text: Quantum kinetically constrained models have recently attracted significant attention due to their anomalous dynamics and thermalization. In this work, we introduce a hitherto unexplored family of kinetically constrained models featuring a conserved particle number and strong inversion-symmetry breaking due to facilitated hopping. We demonstrate that these models provide a generic example of so-called quantum Hilbert space fragmentation, that is manifested in disconnected sectors in the Hilbert space that are not apparent in the computational basis. Quantum Hilbert space fragmentation leads to an exponential in system size number of eigenstates with exactly zero entanglement entropy across several bipartite cuts. These eigenstates can be probed dynamically using quenches from simple initial product states. In addition, we study the particle spreading under unitary dynamics launched from the domain wall state, and find faster than diffusive dynamics at high particle densities, that crosses over into logarithmically slow relaxation at smaller densities. Using a classically simulable cellular automaton, we reproduce the logarithmic dynamics observed in the quantum case. Our work suggests that particle conserving constrained models with inversion symmetry breaking realize so far unexplored universality classes of dynamics and invite their further theoretical and experimental studies. article_number: '2210.15607' article_processing_charge: No author: - first_name: Pietro full_name: Brighi, Pietro id: 4115AF5C-F248-11E8-B48F-1D18A9856A87 last_name: Brighi orcid: 0000-0002-7969-2729 - first_name: Marko full_name: Ljubotina, Marko id: F75EE9BE-5C90-11EA-905D-16643DDC885E last_name: Ljubotina orcid: 0000-0003-0038-7068 - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Brighi P, Ljubotina M, Serbyn M. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. arXiv. doi:10.48550/arXiv.2210.15607 apa: Brighi, P., Ljubotina, M., & Serbyn, M. (n.d.). Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. arXiv. https://doi.org/10.48550/arXiv.2210.15607 chicago: Brighi, Pietro, Marko Ljubotina, and Maksym Serbyn. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” ArXiv, n.d. https://doi.org/10.48550/arXiv.2210.15607. ieee: P. Brighi, M. Ljubotina, and M. Serbyn, “Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models,” arXiv. . ista: Brighi P, Ljubotina M, Serbyn M. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. arXiv, 2210.15607. mla: Brighi, Pietro, et al. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” ArXiv, 2210.15607, doi:10.48550/arXiv.2210.15607. short: P. Brighi, M. Ljubotina, M. Serbyn, ArXiv (n.d.). date_created: 2023-03-23T14:33:13Z date_published: 2022-11-07T00:00:00Z date_updated: 2023-09-20T10:46:29Z day: '07' department: - _id: GradSch - _id: MaSe doi: 10.48550/arXiv.2210.15607 external_id: arxiv: - '2210.15607' language: - iso: eng license: https://creativecommons.org/licenses/by-nc-sa/4.0/ main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2210.15607 month: '11' oa: 1 oa_version: Preprint publication: arXiv publication_status: submitted related_material: record: - id: '12732' relation: dissertation_contains status: public - id: '14334' relation: later_version status: public status: public title: Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models tmp: image: /images/cc_by_nc_sa.png legal_code_url: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode name: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) short: CC BY-NC-SA (4.0) type: preprint user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2022' ... --- _id: '10851' abstract: - lang: eng text: Superconductor-semiconductor hybrid devices are at the heart of several proposed approaches to quantum information processing, but their basic properties remain to be understood. We embed a twodimensional Al-InAs hybrid system in a resonant microwave circuit, probing the breakdown of superconductivity due to an applied magnetic field. We find a fingerprint from the two-component nature of the hybrid system, and quantitatively compare with a theory that includes the contribution of intraband p±ip pairing in the InAs, as well as the emergence of Bogoliubov-Fermi surfaces due to magnetic field. Separately resolving the Al and InAs contributions allows us to determine the carrier density and mobility in the InAs. acknowledged_ssus: - _id: M-Shop - _id: NanoFab acknowledgement: M. S. acknowledges useful discussions with A. Levchenko and P. A. Lee, and E. Berg. This research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication facility. J. S. and A. G. acknowledge funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 754411.W. M. Hatefipour, W. M. Strickland and J. Shabani acknowledge funding from Office of Naval Research Award No. N00014-21-1-2450. article_number: '107701' article_processing_charge: No article_type: original author: - first_name: Duc T full_name: Phan, Duc T id: 29C8C0B4-F248-11E8-B48F-1D18A9856A87 last_name: Phan - first_name: Jorden L full_name: Senior, Jorden L id: 5479D234-2D30-11EA-89CC-40953DDC885E last_name: Senior orcid: 0000-0002-0672-9295 - first_name: Areg full_name: Ghazaryan, Areg id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87 last_name: Ghazaryan orcid: 0000-0001-9666-3543 - first_name: M. full_name: Hatefipour, M. last_name: Hatefipour - first_name: W. M. full_name: Strickland, W. M. last_name: Strickland - first_name: J. full_name: Shabani, J. last_name: Shabani - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Andrew P full_name: Higginbotham, Andrew P id: 4AD6785A-F248-11E8-B48F-1D18A9856A87 last_name: Higginbotham orcid: 0000-0003-2607-2363 citation: ama: Phan DT, Senior JL, Ghazaryan A, et al. Detecting induced p±ip pairing at the Al-InAs interface with a quantum microwave circuit. Physical Review Letters. 2022;128(10). doi:10.1103/physrevlett.128.107701 apa: Phan, D. T., Senior, J. L., Ghazaryan, A., Hatefipour, M., Strickland, W. M., Shabani, J., … Higginbotham, A. P. (2022). Detecting induced p±ip pairing at the Al-InAs interface with a quantum microwave circuit. Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.128.107701 chicago: Phan, Duc T, Jorden L Senior, Areg Ghazaryan, M. Hatefipour, W. M. Strickland, J. Shabani, Maksym Serbyn, and Andrew P Higginbotham. “Detecting Induced P±ip Pairing at the Al-InAs Interface with a Quantum Microwave Circuit.” Physical Review Letters. American Physical Society, 2022. https://doi.org/10.1103/physrevlett.128.107701. ieee: D. T. Phan et al., “Detecting induced p±ip pairing at the Al-InAs interface with a quantum microwave circuit,” Physical Review Letters, vol. 128, no. 10. American Physical Society, 2022. ista: Phan DT, Senior JL, Ghazaryan A, Hatefipour M, Strickland WM, Shabani J, Serbyn M, Higginbotham AP. 2022. Detecting induced p±ip pairing at the Al-InAs interface with a quantum microwave circuit. Physical Review Letters. 128(10), 107701. mla: Phan, Duc T., et al. “Detecting Induced P±ip Pairing at the Al-InAs Interface with a Quantum Microwave Circuit.” Physical Review Letters, vol. 128, no. 10, 107701, American Physical Society, 2022, doi:10.1103/physrevlett.128.107701. short: D.T. Phan, J.L. Senior, A. Ghazaryan, M. Hatefipour, W.M. Strickland, J. Shabani, M. Serbyn, A.P. Higginbotham, Physical Review Letters 128 (2022). date_created: 2022-03-17T11:37:47Z date_published: 2022-03-11T00:00:00Z date_updated: 2023-11-30T10:56:03Z day: '11' department: - _id: MaSe - _id: AnHi doi: 10.1103/physrevlett.128.107701 ec_funded: 1 external_id: arxiv: - '2107.03695' isi: - '000771391100002' pmid: - ' 35333085' intvolume: ' 128' isi: 1 issue: '10' keyword: - General Physics and Astronomy language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2107.03695 month: '03' oa: 1 oa_version: Preprint pmid: 1 project: - _id: 260C2330-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '754411' name: ISTplus - Postdoctoral Fellowships publication: Physical Review Letters publication_identifier: eissn: - 1079-7114 issn: - 0031-9007 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: link: - description: News on ISTA Website relation: press_release url: https://ista.ac.at/en/news/characterizing-super-semi-sandwiches-for-quantum-computing/ record: - id: '10029' relation: earlier_version status: public - id: '14547' relation: dissertation_contains status: public scopus_import: '1' status: public title: Detecting induced p±ip pairing at the Al-InAs interface with a quantum microwave circuit type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 128 year: '2022' ... --- _id: '11471' abstract: - lang: eng text: 'Variational quantum algorithms are promising algorithms for achieving quantum advantage on nearterm devices. The quantum hardware is used to implement a variational wave function and measure observables, whereas the classical computer is used to store and update the variational parameters. The optimization landscape of expressive variational ansätze is however dominated by large regions in parameter space, known as barren plateaus, with vanishing gradients, which prevents efficient optimization. In this work we propose a general algorithm to avoid barren plateaus in the initialization and throughout the optimization. To this end we define a notion of weak barren plateaus (WBPs) based on the entropies of local reduced density matrices. The presence of WBPs can be efficiently quantified using recently introduced shadow tomography of the quantum state with a classical computer. We demonstrate that avoidance of WBPs suffices to ensure sizable gradients in the initialization. In addition, we demonstrate that decreasing the gradient step size, guided by the entropies allows WBPs to be avoided during the optimization process. This paves the way for efficient barren plateau-free optimization on near-term devices. ' acknowledgement: "We thank Marco Cerezo, Zoe Holmes, and Nicholas Hunter-Jones for fruitful discussion and valuable feedback. We also acknowledge Adam Smith, Johannes Jakob Meyer, and Victor V. Albert for comments on the paper. The simulations were performed in the Julia programming\r\nlanguage [65] using the Yao module [66]. S.H.S., R.A.M., A.A.M. and M.S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899)." article_number: '020365' article_processing_charge: No article_type: original author: - first_name: Stefan full_name: Sack, Stefan id: dd622248-f6e0-11ea-865d-ce382a1c81a5 last_name: Sack orcid: 0000-0001-5400-8508 - first_name: Raimel A full_name: Medina Ramos, Raimel A id: CE680B90-D85A-11E9-B684-C920E6697425 last_name: Medina Ramos orcid: 0000-0002-5383-2869 - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis orcid: 0000-0002-8443-1064 - first_name: Richard full_name: Kueng, Richard last_name: Kueng - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Sack S, Medina Ramos RA, Michailidis A, Kueng R, Serbyn M. Avoiding barren plateaus using classical shadows. PRX Quantum. 2022;3(2). doi:10.1103/prxquantum.3.020365 apa: Sack, S., Medina Ramos, R. A., Michailidis, A., Kueng, R., & Serbyn, M. (2022). Avoiding barren plateaus using classical shadows. PRX Quantum. American Physical Society. https://doi.org/10.1103/prxquantum.3.020365 chicago: Sack, Stefan, Raimel A Medina Ramos, Alexios Michailidis, Richard Kueng, and Maksym Serbyn. “Avoiding Barren Plateaus Using Classical Shadows.” PRX Quantum. American Physical Society, 2022. https://doi.org/10.1103/prxquantum.3.020365. ieee: S. Sack, R. A. Medina Ramos, A. Michailidis, R. Kueng, and M. Serbyn, “Avoiding barren plateaus using classical shadows,” PRX Quantum, vol. 3, no. 2. American Physical Society, 2022. ista: Sack S, Medina Ramos RA, Michailidis A, Kueng R, Serbyn M. 2022. Avoiding barren plateaus using classical shadows. PRX Quantum. 3(2), 020365. mla: Sack, Stefan, et al. “Avoiding Barren Plateaus Using Classical Shadows.” PRX Quantum, vol. 3, no. 2, 020365, American Physical Society, 2022, doi:10.1103/prxquantum.3.020365. short: S. Sack, R.A. Medina Ramos, A. Michailidis, R. Kueng, M. Serbyn, PRX Quantum 3 (2022). date_created: 2022-06-29T20:21:32Z date_published: 2022-06-29T00:00:00Z date_updated: 2023-12-13T14:47:24Z day: '29' ddc: - '530' department: - _id: MaSe doi: 10.1103/prxquantum.3.020365 ec_funded: 1 external_id: arxiv: - '2201.08194' isi: - '000822564300001' file: - access_level: open_access checksum: a7706b28d24a0e32a55ea04b82a2df43 content_type: application/pdf creator: dernst date_created: 2022-06-30T07:14:48Z date_updated: 2022-06-30T07:14:48Z file_id: '11472' file_name: 2022_PRXQuantum_Sack.pdf file_size: 4231591 relation: main_file success: 1 file_date_updated: 2022-06-30T07:14:48Z has_accepted_license: '1' intvolume: ' 3' isi: 1 issue: '2' keyword: - General Medicine language: - iso: eng month: '06' oa: 1 oa_version: Published Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: PRX Quantum publication_identifier: issn: - 2691-3399 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: record: - id: '14622' relation: dissertation_contains status: public status: public title: Avoiding barren plateaus using classical shadows tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 3 year: '2022' ... --- _id: '9224' abstract: - lang: eng text: We re-examine attempts to study the many-body localization transition using measures that are physically natural on the ergodic/quantum chaotic regime of the phase diagram. Using simple scaling arguments and an analysis of various models for which rigorous results are available, we find that these measures can be particularly adversely affected by the strong finite-size effects observed in nearly all numerical studies of many-body localization. This severely impacts their utility in probing the transition and the localized phase. In light of this analysis, we discuss a recent study (Šuntajs et al., 2020) of the behaviour of the Thouless energy and level repulsion in disordered spin chains, and its implications for the question of whether MBL is a true phase of matter. article_number: '168415' article_processing_charge: No article_type: original author: - first_name: D. A. full_name: Abanin, D. A. last_name: Abanin - first_name: J. H. full_name: Bardarson, J. H. last_name: Bardarson - first_name: G. full_name: De Tomasi, G. last_name: De Tomasi - first_name: S. full_name: Gopalakrishnan, S. last_name: Gopalakrishnan - first_name: V. full_name: Khemani, V. last_name: Khemani - first_name: S. A. full_name: Parameswaran, S. A. last_name: Parameswaran - first_name: F. full_name: Pollmann, F. last_name: Pollmann - first_name: A. C. full_name: Potter, A. C. last_name: Potter - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: R. full_name: Vasseur, R. last_name: Vasseur citation: ama: 'Abanin DA, Bardarson JH, De Tomasi G, et al. Distinguishing localization from chaos: Challenges in finite-size systems. Annals of Physics. 2021;427(4). doi:10.1016/j.aop.2021.168415' apa: 'Abanin, D. A., Bardarson, J. H., De Tomasi, G., Gopalakrishnan, S., Khemani, V., Parameswaran, S. A., … Vasseur, R. (2021). Distinguishing localization from chaos: Challenges in finite-size systems. Annals of Physics. Elsevier. https://doi.org/10.1016/j.aop.2021.168415' chicago: 'Abanin, D. A., J. H. Bardarson, G. De Tomasi, S. Gopalakrishnan, V. Khemani, S. A. Parameswaran, F. Pollmann, A. C. Potter, Maksym Serbyn, and R. Vasseur. “Distinguishing Localization from Chaos: Challenges in Finite-Size Systems.” Annals of Physics. Elsevier, 2021. https://doi.org/10.1016/j.aop.2021.168415.' ieee: 'D. A. Abanin et al., “Distinguishing localization from chaos: Challenges in finite-size systems,” Annals of Physics, vol. 427, no. 4. Elsevier, 2021.' ista: 'Abanin DA, Bardarson JH, De Tomasi G, Gopalakrishnan S, Khemani V, Parameswaran SA, Pollmann F, Potter AC, Serbyn M, Vasseur R. 2021. Distinguishing localization from chaos: Challenges in finite-size systems. Annals of Physics. 427(4), 168415.' mla: 'Abanin, D. A., et al. “Distinguishing Localization from Chaos: Challenges in Finite-Size Systems.” Annals of Physics, vol. 427, no. 4, 168415, Elsevier, 2021, doi:10.1016/j.aop.2021.168415.' short: D.A. Abanin, J.H. Bardarson, G. De Tomasi, S. Gopalakrishnan, V. Khemani, S.A. Parameswaran, F. Pollmann, A.C. Potter, M. Serbyn, R. Vasseur, Annals of Physics 427 (2021). date_created: 2021-03-07T23:01:25Z date_published: 2021-04-01T00:00:00Z date_updated: 2023-08-07T13:58:30Z day: '01' department: - _id: MaSe doi: 10.1016/j.aop.2021.168415 external_id: arxiv: - '1911.04501' isi: - '000634879800007' intvolume: ' 427' isi: 1 issue: '4' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1911.04501 month: '04' oa: 1 oa_version: Preprint publication: Annals of Physics publication_identifier: eissn: - 1096035X issn: - '00034916' publication_status: published publisher: Elsevier quality_controlled: '1' scopus_import: '1' status: public title: 'Distinguishing localization from chaos: Challenges in finite-size systems' type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 427 year: '2021' ... --- _id: '9618' abstract: - lang: eng text: The control of nonequilibrium quantum dynamics in many-body systems is challenging because interactions typically lead to thermalization and a chaotic spreading throughout Hilbert space. We investigate nonequilibrium dynamics after rapid quenches in a many-body system composed of 3 to 200 strongly interacting qubits in one and two spatial dimensions. Using a programmable quantum simulator based on Rydberg atom arrays, we show that coherent revivals associated with so-called quantum many-body scars can be stabilized by periodic driving, which generates a robust subharmonic response akin to discrete time-crystalline order. We map Hilbert space dynamics, geometry dependence, phase diagrams, and system-size dependence of this emergent phenomenon, demonstrating new ways to steer complex dynamics in many-body systems and enabling potential applications in quantum information science. acknowledgement: 'We thank many members of the Harvard AMO community, particularly E. Urbach, S. Dakoulas, and J. Doyle for their efforts enabling safe and productive operation of our laboratories during 2020. We thank D. Abanin, I. Cong, F. Machado, H. Pichler, N. Yao, B. Ye, and H. Zhou for stimulating discussions. Funding: We acknowledge financial support from the Center for Ultracold Atoms, the National Science Foundation, the Vannevar Bush Faculty Fellowship, the U.S. Department of Energy (LBNL QSA Center and grant no. DE-SC0021013), the Office of Naval Research, the Army Research Office MURI, the DARPA DRINQS program (grant no. D18AC00033), and the DARPA ONISQ program (grant no. W911NF2010021). The authors acknowledge support from the NSF Graduate Research Fellowship Program (grant DGE1745303) and The Fannie and John Hertz Foundation (D.B.); a National Defense Science and Engineering Graduate (NDSEG) fellowship (H.L.); a fellowship from the Max Planck/Harvard Research Center for Quantum Optics (G.S.); Gordon College (T.T.W.); the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement no. 850899) (A.A.M. and M.S.); a Department of Energy Computational Science Graduate Fellowship under award number DE-SC0021110 (N.M.); the Moore Foundation’s EPiQS Initiative grant no. GBMF4306, the NUS Development grant AY2019/2020, and the Stanford Institute of Theoretical Physics (W.W.H.); and the Miller Institute for Basic Research in Science (S.C.). Author contributions: D.B., A.O., H.L., A.K., G.S., S.E., and T.T.W. contributed to the building of the experimental setup, performed the measurements, and analyzed the data. A.A.M., N.M., W.W.H., S.C., and M.S. performed theoretical analysis. All work was supervised by M.G., V.V., and M.D.L. All authors discussed the results and contributed to the manuscript. Competing interests: M.G., V.V., and M.D.L. are co-founders and shareholders of QuEra Computing. A.O. is a shareholder of QuEra Computing. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and the supplementary materials.' article_processing_charge: No article_type: original author: - first_name: D. full_name: Bluvstein, D. last_name: Bluvstein - first_name: A. full_name: Omran, A. last_name: Omran - first_name: H. full_name: Levine, H. last_name: Levine - first_name: A. full_name: Keesling, A. last_name: Keesling - first_name: G. full_name: Semeghini, G. last_name: Semeghini - first_name: S. full_name: Ebadi, S. last_name: Ebadi - first_name: T. T. full_name: Wang, T. T. last_name: Wang - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis orcid: 0000-0002-8443-1064 - first_name: N. full_name: Maskara, N. last_name: Maskara - first_name: W. W. full_name: Ho, W. W. last_name: Ho - first_name: S. full_name: Choi, S. last_name: Choi - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: M. full_name: Greiner, M. last_name: Greiner - first_name: V. full_name: Vuletić, V. last_name: Vuletić - first_name: M. D. full_name: Lukin, M. D. last_name: Lukin citation: ama: Bluvstein D, Omran A, Levine H, et al. Controlling quantum many-body dynamics in driven Rydberg atom arrays. Science. 2021;371(6536):1355-1359. doi:10.1126/science.abg2530 apa: Bluvstein, D., Omran, A., Levine, H., Keesling, A., Semeghini, G., Ebadi, S., … Lukin, M. D. (2021). Controlling quantum many-body dynamics in driven Rydberg atom arrays. Science. AAAS. https://doi.org/10.1126/science.abg2530 chicago: Bluvstein, D., A. Omran, H. Levine, A. Keesling, G. Semeghini, S. Ebadi, T. T. Wang, et al. “Controlling Quantum Many-Body Dynamics in Driven Rydberg Atom Arrays.” Science. AAAS, 2021. https://doi.org/10.1126/science.abg2530. ieee: D. Bluvstein et al., “Controlling quantum many-body dynamics in driven Rydberg atom arrays,” Science, vol. 371, no. 6536. AAAS, pp. 1355–1359, 2021. ista: Bluvstein D, Omran A, Levine H, Keesling A, Semeghini G, Ebadi S, Wang TT, Michailidis A, Maskara N, Ho WW, Choi S, Serbyn M, Greiner M, Vuletić V, Lukin MD. 2021. Controlling quantum many-body dynamics in driven Rydberg atom arrays. Science. 371(6536), 1355–1359. mla: Bluvstein, D., et al. “Controlling Quantum Many-Body Dynamics in Driven Rydberg Atom Arrays.” Science, vol. 371, no. 6536, AAAS, 2021, pp. 1355–59, doi:10.1126/science.abg2530. short: D. Bluvstein, A. Omran, H. Levine, A. Keesling, G. Semeghini, S. Ebadi, T.T. Wang, A. Michailidis, N. Maskara, W.W. Ho, S. Choi, M. Serbyn, M. Greiner, V. Vuletić, M.D. Lukin, Science 371 (2021) 1355–1359. date_created: 2021-06-29T12:04:05Z date_published: 2021-03-26T00:00:00Z date_updated: 2023-08-10T13:57:07Z day: '26' ddc: - '539' department: - _id: MaSe doi: 10.1126/science.abg2530 ec_funded: 1 external_id: arxiv: - '2012.12276' isi: - '000636043400048' pmid: - '33632894' file: - access_level: open_access checksum: 0b356fd10ab9bb95177d4c047d4e9c1a content_type: application/pdf creator: patrickd date_created: 2021-09-23T14:00:05Z date_updated: 2021-09-23T14:00:05Z file_id: '10040' file_name: scars_subharmonic_combined_manuscript_2_11_2021 (2)-1.pdf file_size: 3671159 relation: main_file success: 1 file_date_updated: 2021-09-23T14:00:05Z has_accepted_license: '1' intvolume: ' 371' isi: 1 issue: '6536' keyword: - Multidisciplinary language: - iso: eng month: '03' oa: 1 oa_version: Preprint page: 1355-1359 pmid: 1 project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Science publication_identifier: eissn: - 1095-9203 issn: - 0036-8075 publication_status: published publisher: AAAS quality_controlled: '1' scopus_import: '1' status: public title: Controlling quantum many-body dynamics in driven Rydberg atom arrays type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 371 year: '2021' ... --- _id: '9903' abstract: - lang: eng text: Eigenstate thermalization in quantum many-body systems implies that eigenstates at high energy are similar to random vectors. Identifying systems where at least some eigenstates are nonthermal is an outstanding question. In this Letter we show that interacting quantum models that have a nullspace—a degenerate subspace of eigenstates at zero energy (zero modes), which corresponds to infinite temperature, provide a route to nonthermal eigenstates. We analytically show the existence of a zero mode which can be represented as a matrix product state for a certain class of local Hamiltonians. In the more general case we use a subspace disentangling algorithm to generate an orthogonal basis of zero modes characterized by increasing entanglement entropy. We show evidence for an area-law entanglement scaling of the least-entangled zero mode in the broad parameter regime, leading to a conjecture that all local Hamiltonians with the nullspace feature zero modes with area-law entanglement scaling and, as such, break the strong thermalization hypothesis. Finally, we find zero modes in constrained models and propose a setup for observing their experimental signatures. acknowledgement: "We acknowledge useful discussions with V. Gritsev and A. Garkun and suggestions on implementation of the\r\nPPXPP model by D. Bluvstein. A. M. and M. S. were supported by the European Research Council (ERC) under\r\nthe European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899)" article_number: '060602' article_processing_charge: Yes (in subscription journal) article_type: letter_note author: - first_name: Volker full_name: Karle, Volker id: D7C012AE-D7ED-11E9-95E8-1EC5E5697425 last_name: Karle orcid: 0000-0002-6963-0129 - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis orcid: 0000-0002-8443-1064 citation: ama: Karle V, Serbyn M, Michailidis A. Area-law entangled eigenstates from nullspaces of local Hamiltonians. Physical Review Letters. 2021;127(6). doi:10.1103/physrevlett.127.060602 apa: Karle, V., Serbyn, M., & Michailidis, A. (2021). Area-law entangled eigenstates from nullspaces of local Hamiltonians. Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.127.060602 chicago: Karle, Volker, Maksym Serbyn, and Alexios Michailidis. “Area-Law Entangled Eigenstates from Nullspaces of Local Hamiltonians.” Physical Review Letters. American Physical Society, 2021. https://doi.org/10.1103/physrevlett.127.060602. ieee: V. Karle, M. Serbyn, and A. Michailidis, “Area-law entangled eigenstates from nullspaces of local Hamiltonians,” Physical Review Letters, vol. 127, no. 6. American Physical Society, 2021. ista: Karle V, Serbyn M, Michailidis A. 2021. Area-law entangled eigenstates from nullspaces of local Hamiltonians. Physical Review Letters. 127(6), 060602. mla: Karle, Volker, et al. “Area-Law Entangled Eigenstates from Nullspaces of Local Hamiltonians.” Physical Review Letters, vol. 127, no. 6, 060602, American Physical Society, 2021, doi:10.1103/physrevlett.127.060602. short: V. Karle, M. Serbyn, A. Michailidis, Physical Review Letters 127 (2021). date_created: 2021-08-13T09:27:39Z date_published: 2021-08-06T00:00:00Z date_updated: 2023-08-11T10:43:27Z day: '06' ddc: - '539' department: - _id: MaSe - _id: GradSch - _id: MiLe doi: 10.1103/physrevlett.127.060602 ec_funded: 1 external_id: arxiv: - '2102.13633' isi: - '000684276000002' file: - access_level: open_access checksum: 51218f302dcef99d90d1209809fcc874 content_type: application/pdf creator: mserbyn date_created: 2021-08-13T09:28:08Z date_updated: 2021-08-13T09:28:08Z file_id: '9904' file_name: PhysRevLett.127.060602_SOM.pdf file_size: 5064231 relation: main_file success: 1 file_date_updated: 2021-08-13T09:28:08Z has_accepted_license: '1' intvolume: ' 127' isi: 1 issue: '6' language: - iso: eng month: '08' oa: 1 oa_version: Published Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review Letters publication_identifier: eissn: - 1079-7114 issn: - 0031-9007 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Area-law entangled eigenstates from nullspaces of local Hamiltonians tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 127 year: '2021' ... --- _id: '9960' abstract: - lang: eng text: The control of many-body quantum dynamics in complex systems is a key challenge in the quest to reliably produce and manipulate large-scale quantum entangled states. Recently, quench experiments in Rydberg atom arrays [Bluvstein et al. Science 371, 1355 (2021)] demonstrated that coherent revivals associated with quantum many-body scars can be stabilized by periodic driving, generating stable subharmonic responses over a wide parameter regime. We analyze a simple, related model where these phenomena originate from spatiotemporal ordering in an effective Floquet unitary, corresponding to discrete time-crystalline behavior in a prethermal regime. Unlike conventional discrete time crystals, the subharmonic response exists only for Néel-like initial states, associated with quantum scars. We predict robustness to perturbations and identify emergent timescales that could be observed in future experiments. Our results suggest a route to controlling entanglement in interacting quantum systems by combining periodic driving with many-body scars. acknowledgement: We thank Dmitry Abanin, Ehud Altman, Iris Cong, Sepehr Ebadi, Alex Keesling, Harry Levine, Ahmed Omran, Hannes Pichler, Rhine Samajdar, Guilia Semeghini, Tout Wang, Norman Yao, and Harry Zhou or stimulating discussions. We acknowledge support from the Center for Ultracold Atoms, the National Science Foundation, the Vannevar Bush Faculty Fellowship, the U.S. Department of Energy, the Army Research Office MURI, and the DARPA ONISQ program (M. L., N. M, W. W. H., D. B.); the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Programme Grant Agreement No. 850899 (A. M. and M. S.); the Department of Energy Computational Science Graduate Fellowship under Awards No. DESC0021110 (N. M.); the Moore Foundation EPiQS initiative Grant No. GBMF4306, the National University of Singapore (NUS) Development Grant AY2019/2020 and the Stanford Institute for Theoretical Physics (W. W. H.); the NSF Graduate Research Fellowship Program (Grant No. DGE1745303) and The Fannie and John Hertz Foundation (D. B.); the Miller Institute for Basic Research in Science (S. C.); DOE Quantum Systems Accelerator – Contract No. 7568717; and DOE Programmable Quantum Simulators for Lattice Gauge Theories and Gauge-Gravity Correspondence – Grant No. DE-SC0021013. article_number: '090602' article_processing_charge: No article_type: letter_note author: - first_name: N. full_name: Maskara, N. last_name: Maskara - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis orcid: 0000-0002-8443-1064 - first_name: W. W. full_name: Ho, W. W. last_name: Ho - first_name: D. full_name: Bluvstein, D. last_name: Bluvstein - first_name: S. full_name: Choi, S. last_name: Choi - first_name: M. D. full_name: Lukin, M. D. last_name: Lukin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: 'Maskara N, Michailidis A, Ho WW, et al. Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving. Physical Review Letters. 2021;127(9). doi:10.1103/PhysRevLett.127.090602' apa: 'Maskara, N., Michailidis, A., Ho, W. W., Bluvstein, D., Choi, S., Lukin, M. D., & Serbyn, M. (2021). Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.127.090602' chicago: 'Maskara, N., Alexios Michailidis, W. W. Ho, D. Bluvstein, S. Choi, M. D. Lukin, and Maksym Serbyn. “Discrete Time-Crystalline Order Enabled by Quantum Many-Body Scars: Entanglement Steering via Periodic Driving.” Physical Review Letters. American Physical Society, 2021. https://doi.org/10.1103/PhysRevLett.127.090602.' ieee: 'N. Maskara et al., “Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving,” Physical Review Letters, vol. 127, no. 9. American Physical Society, 2021.' ista: 'Maskara N, Michailidis A, Ho WW, Bluvstein D, Choi S, Lukin MD, Serbyn M. 2021. Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving. Physical Review Letters. 127(9), 090602.' mla: 'Maskara, N., et al. “Discrete Time-Crystalline Order Enabled by Quantum Many-Body Scars: Entanglement Steering via Periodic Driving.” Physical Review Letters, vol. 127, no. 9, 090602, American Physical Society, 2021, doi:10.1103/PhysRevLett.127.090602.' short: N. Maskara, A. Michailidis, W.W. Ho, D. Bluvstein, S. Choi, M.D. Lukin, M. Serbyn, Physical Review Letters 127 (2021). date_created: 2021-08-28T08:08:58Z date_published: 2021-08-27T00:00:00Z date_updated: 2023-08-11T10:57:51Z day: '27' department: - _id: MaSe doi: 10.1103/PhysRevLett.127.090602 ec_funded: 1 external_id: arxiv: - '2102.13160' isi: - '000692200100002' intvolume: ' 127' isi: 1 issue: '9' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2102.13160 month: '08' oa: 1 oa_version: Submitted Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review Letters publication_identifier: eissn: - 1079-7114 issn: - 0031-9007 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: 'Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving' type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 127 year: '2021' ... --- _id: '9961' abstract: - lang: eng text: The notion of Thouless energy plays a central role in the theory of Anderson localization. We investigate and compare the scaling of Thouless energy across the many-body localization (MBL) transition in a Floquet model. We use a combination of methods that are reliable on the ergodic side of the transition (e.g., spectral form factor) and methods that work on the MBL side (e.g., typical matrix elements of local operators) to obtain a complete picture of the Thouless energy behavior across the transition. On the ergodic side, Thouless energy decreases slowly with the system size, while at the transition it becomes comparable to the level spacing. Different probes yield consistent estimates of Thouless energy in their overlapping regime of applicability, giving the location of the transition point nearly free of finite-size drift. This work establishes a connection between different definitions of Thouless energy in a many-body setting and yields insights into the MBL transition in Floquet systems. acknowledgement: "We thank S. Garratt for useful comments on the manuscript. This work was supported by the Swiss National Science Foundation (M. Sonner and D.A.A.) and by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (M. Serbyn, Grant Agreement No. 850899, and D.A.A., Grant Agreement No. 864597). Z.P. acknowledges support from EPSRC Grant No. EP/R020612/1 and from Leverhulme Trust Research Leadership Award No. RL-2019-015. The computations were performed on the Baobab cluster of the University\r\nof Geneva." article_number: L081112 article_processing_charge: No article_type: letter_note author: - first_name: Michael full_name: Sonner, Michael last_name: Sonner - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Zlatko full_name: Papić, Zlatko last_name: Papić - first_name: Dmitry A. full_name: Abanin, Dmitry A. last_name: Abanin citation: ama: Sonner M, Serbyn M, Papić Z, Abanin DA. Thouless energy across the many-body localization transition in Floquet systems. Physical Review B. 2021;104(8). doi:10.1103/PhysRevB.104.L081112 apa: Sonner, M., Serbyn, M., Papić, Z., & Abanin, D. A. (2021). Thouless energy across the many-body localization transition in Floquet systems. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.104.L081112 chicago: Sonner, Michael, Maksym Serbyn, Zlatko Papić, and Dmitry A. Abanin. “Thouless Energy across the Many-Body Localization Transition in Floquet Systems.” Physical Review B. American Physical Society, 2021. https://doi.org/10.1103/PhysRevB.104.L081112. ieee: M. Sonner, M. Serbyn, Z. Papić, and D. A. Abanin, “Thouless energy across the many-body localization transition in Floquet systems,” Physical Review B, vol. 104, no. 8. American Physical Society, 2021. ista: Sonner M, Serbyn M, Papić Z, Abanin DA. 2021. Thouless energy across the many-body localization transition in Floquet systems. Physical Review B. 104(8), L081112. mla: Sonner, Michael, et al. “Thouless Energy across the Many-Body Localization Transition in Floquet Systems.” Physical Review B, vol. 104, no. 8, L081112, American Physical Society, 2021, doi:10.1103/PhysRevB.104.L081112. short: M. Sonner, M. Serbyn, Z. Papić, D.A. Abanin, Physical Review B 104 (2021). date_created: 2021-08-28T16:44:55Z date_published: 2021-08-15T00:00:00Z date_updated: 2023-08-11T10:57:09Z day: '15' department: - _id: MaSe doi: 10.1103/PhysRevB.104.L081112 ec_funded: 1 external_id: arxiv: - '2012.15676' isi: - '000689734500009' intvolume: ' 104' isi: 1 issue: '8' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2012.15676 month: '08' oa: 1 oa_version: Submitted Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Thouless energy across the many-body localization transition in Floquet systems type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 104 year: '2021' ... --- _id: '10025' abstract: - lang: eng text: Ferromagnetism is most common in transition metal compounds but may also arise in low-density two-dimensional electron systems, with signatures observed in silicon, III-V semiconductor systems, and graphene moiré heterostructures. Here we show that gate-tuned van Hove singularities in rhombohedral trilayer graphene drive the spontaneous ferromagnetic polarization of the electron system into one or more spin- and valley flavors. Using capacitance measurements on graphite-gated van der Waals heterostructures, we find a cascade of density- and electronic displacement field tuned phase transitions marked by negative electronic compressibility. The transitions define the boundaries between phases where quantum oscillations have either four-fold, two-fold, or one-fold degeneracy, associated with a spin and valley degenerate normal metal, spin-polarized `half-metal', and spin and valley polarized `quarter metal', respectively. For electron doping, the salient features are well captured by a phenomenological Stoner model with a valley-anisotropic Hund's coupling, likely arising from interactions at the lattice scale. For hole filling, we observe a richer phase diagram featuring a delicate interplay of broken symmetries and transitions in the Fermi surface topology. Finally, by rotational alignment of a hexagonal boron nitride substrate to induce a moiré superlattice, we find that the superlattice perturbs the preexisting isospin order only weakly, leaving the basic phase diagram intact while catalyzing the formation of topologically nontrivial gapped states whenever itinerant half- or quarter metal states occur at half- or quarter superlattice band filling. Our results show that rhombohedral trilayer graphene is an ideal platform for well-controlled tests of many-body theory and reveal magnetism in moiré materials to be fundamentally itinerant in nature. acknowledgement: "The authors acknowledge discussions with A. Macdonald, L. Fu, F. Wang and M. Zaletel. AFY acknowledges support of the National Science Foundation under DMR1654186, and the Gordon and Betty Moore Foundation under award GBMF9471. The authors acknowledge the use of the research facilities within the California NanoSystems Institute, supported by the University of California, Santa Barbara and the University of California, Office of the President.\r\nK.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant Number JPMXP0112101001 and JSPS KAKENHI, Grant Number JP20H00354. EB and TH were supported by the European Research Council (ERC) under grant HQMAT (Grant Agreement No. 817799). A.G. acknowledges support by the European Unions Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement\r\nNo. 754411.\r\n" article_processing_charge: No article_type: original author: - first_name: Haoxin full_name: Zhou, Haoxin last_name: Zhou - first_name: Tian full_name: Xie, Tian last_name: Xie - first_name: Areg full_name: Ghazaryan, Areg id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87 last_name: Ghazaryan orcid: 0000-0001-9666-3543 - first_name: Tobias full_name: Holder, Tobias last_name: Holder - first_name: James R. full_name: Ehrets, James R. last_name: Ehrets - first_name: Eric M. full_name: Spanton, Eric M. last_name: Spanton - first_name: Takashi full_name: Taniguchi, Takashi last_name: Taniguchi - first_name: Kenji full_name: Watanabe, Kenji last_name: Watanabe - first_name: Erez full_name: Berg, Erez last_name: Berg - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Andrea F. full_name: Young, Andrea F. last_name: Young citation: ama: Zhou H, Xie T, Ghazaryan A, et al. Half and quarter metals in rhombohedral trilayer graphene. Nature. 2021. doi:10.1038/s41586-021-03938-w apa: Zhou, H., Xie, T., Ghazaryan, A., Holder, T., Ehrets, J. R., Spanton, E. M., … Young, A. F. (2021). Half and quarter metals in rhombohedral trilayer graphene. Nature. Springer Nature. https://doi.org/10.1038/s41586-021-03938-w chicago: Zhou, Haoxin, Tian Xie, Areg Ghazaryan, Tobias Holder, James R. Ehrets, Eric M. Spanton, Takashi Taniguchi, et al. “Half and Quarter Metals in Rhombohedral Trilayer Graphene.” Nature. Springer Nature, 2021. https://doi.org/10.1038/s41586-021-03938-w. ieee: H. Zhou et al., “Half and quarter metals in rhombohedral trilayer graphene,” Nature. Springer Nature, 2021. ista: Zhou H, Xie T, Ghazaryan A, Holder T, Ehrets JR, Spanton EM, Taniguchi T, Watanabe K, Berg E, Serbyn M, Young AF. 2021. Half and quarter metals in rhombohedral trilayer graphene. Nature. mla: Zhou, Haoxin, et al. “Half and Quarter Metals in Rhombohedral Trilayer Graphene.” Nature, Springer Nature, 2021, doi:10.1038/s41586-021-03938-w. short: H. Zhou, T. Xie, A. Ghazaryan, T. Holder, J.R. Ehrets, E.M. Spanton, T. Taniguchi, K. Watanabe, E. Berg, M. Serbyn, A.F. Young, Nature (2021). date_created: 2021-09-19T22:01:25Z date_published: 2021-09-01T00:00:00Z date_updated: 2023-08-14T07:04:06Z day: '01' department: - _id: MaSe - _id: MiLe doi: 10.1038/s41586-021-03938-w ec_funded: 1 external_id: arxiv: - '2104.00653' isi: - '000706977400002' isi: 1 keyword: - condensed matter - mesoscale and nanoscale physics - condensed matter - strongly correlated electrons - multidisciplinary language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2104.00653 month: '09' oa: 1 oa_version: Preprint project: - _id: 260C2330-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '754411' name: ISTplus - Postdoctoral Fellowships publication: Nature publication_identifier: eissn: - 1476-4687 issn: - 0028-0836 publication_status: published publisher: Springer Nature quality_controlled: '1' related_material: link: - relation: erratum url: https://doi.org/10.1038/s41586-021-04181-z scopus_import: '1' status: public title: Half and quarter metals in rhombohedral trilayer graphene type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 year: '2021' ... --- _id: '10067' abstract: - lang: eng text: The search for novel entangled phases of matter has lead to the recent discovery of a new class of “entanglement transitions,” exemplified by random tensor networks and monitored quantum circuits. Most known examples can be understood as some classical ordering transitions in an underlying statistical mechanics model, where entanglement maps onto the free-energy cost of inserting a domain wall. In this paper we study the possibility of entanglement transitions driven by physics beyond such statistical mechanics mappings. Motivated by recent applications of neural-network-inspired variational Ansätze, we investigate under what conditions on the variational parameters these Ansätze can capture an entanglement transition. We study the entanglement scaling of short-range restricted Boltzmann machine (RBM) quantum states with random phases. For uncorrelated random phases, we analytically demonstrate the absence of an entanglement transition and reveal subtle finite-size effects in finite-size numerical simulations. Introducing phases with correlations decaying as 1/r^α in real space, we observe three regions with a different scaling of entanglement entropy depending on the exponent α. We study the nature of the transition between these regions, finding numerical evidence for critical behavior. Our work establishes the presence of long-range correlated phases in RBM-based wave functions as a required ingredient for entanglement transitions. acknowledgement: We would like to thank S. De Nicola, P. Brighi, and V. Karle for fruitful discussions and valuable feedback on the manuscript. R.M. and M.S. acknowledge support by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Grant Agreement No. 850899). R.V. acknowledges support from the US Department of Energy, Office of Science, Basic Energy Sciences, under Early Career Award No. DE-SC0019168, and the Alfred P. Sloan Foundation through a Sloan Research Fellowship. article_number: '104205' article_processing_charge: No article_type: original author: - first_name: Raimel A full_name: Medina Ramos, Raimel A id: CE680B90-D85A-11E9-B684-C920E6697425 last_name: Medina Ramos orcid: 0000-0002-5383-2869 - first_name: Romain full_name: Vasseur, Romain last_name: Vasseur - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Medina Ramos RA, Vasseur R, Serbyn M. Entanglement transitions from restricted Boltzmann machines. Physical Review B. 2021;104(10). doi:10.1103/physrevb.104.104205 apa: Medina Ramos, R. A., Vasseur, R., & Serbyn, M. (2021). Entanglement transitions from restricted Boltzmann machines. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.104.104205 chicago: Medina Ramos, Raimel A, Romain Vasseur, and Maksym Serbyn. “Entanglement Transitions from Restricted Boltzmann Machines.” Physical Review B. American Physical Society, 2021. https://doi.org/10.1103/physrevb.104.104205. ieee: R. A. Medina Ramos, R. Vasseur, and M. Serbyn, “Entanglement transitions from restricted Boltzmann machines,” Physical Review B, vol. 104, no. 10. American Physical Society, 2021. ista: Medina Ramos RA, Vasseur R, Serbyn M. 2021. Entanglement transitions from restricted Boltzmann machines. Physical Review B. 104(10), 104205. mla: Medina Ramos, Raimel A., et al. “Entanglement Transitions from Restricted Boltzmann Machines.” Physical Review B, vol. 104, no. 10, 104205, American Physical Society, 2021, doi:10.1103/physrevb.104.104205. short: R.A. Medina Ramos, R. Vasseur, M. Serbyn, Physical Review B 104 (2021). date_created: 2021-10-02T09:03:42Z date_published: 2021-09-30T00:00:00Z date_updated: 2023-08-14T07:24:47Z day: '30' department: - _id: MaSe doi: 10.1103/physrevb.104.104205 ec_funded: 1 external_id: arxiv: - '2107.05735' isi: - '000704414400002' intvolume: ' 104' isi: 1 issue: '10' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2107.05735 month: '09' oa: 1 oa_version: Preprint project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Entanglement transitions from restricted Boltzmann machines type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 104 year: '2021' ... --- _id: '10527' abstract: - lang: eng text: We show that in a two-dimensional electron gas with an annular Fermi surface, long-range Coulomb interactions can lead to unconventional superconductivity by the Kohn-Luttinger mechanism. Superconductivity is strongly enhanced when the inner and outer Fermi surfaces are close to each other. The most prevalent state has chiral p-wave symmetry, but d-wave and extended s-wave pairing are also possible. We discuss these results in the context of rhombohedral trilayer graphene, where superconductivity was recently discovered in regimes where the normal state has an annular Fermi surface. Using realistic parameters, our mechanism can account for the order of magnitude of Tc, as well as its trends as a function of electron density and perpendicular displacement field. Moreover, it naturally explains some of the outstanding puzzles in this material, that include the weak temperature dependence of the resistivity above Tc, and the proximity of spin singlet superconductivity to the ferromagnetic phase. acknowledgement: We thank Yang-Zhi Chou, Andrey Chubukov, Johannes Hofmann, Steve Kivelson, Sri Raghu, and Sankar das Sarma, Jay Sau, Fengcheng Wu, and Andrea Young for many stimulating discussions and for their comments on the manuscript. E.B. thanks S. Chatterjee, T. Wang, and M. Zaletel for a collaboration on a related topic. A.G. acknowledges support by the European Unions Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No. 754411. E.B. and T.H. were supported by the European Research Council (ERC) under grant HQMAT (Grant Agreement No. 817799), by the Israel-USA Binational Science Foundation (BSF), and by a Research grant from Irving and Cherna Moskowitz. article_number: '247001' article_processing_charge: No article_type: original author: - first_name: Areg full_name: Ghazaryan, Areg id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87 last_name: Ghazaryan orcid: 0000-0001-9666-3543 - first_name: Tobias full_name: Holder, Tobias last_name: Holder - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Erez full_name: Berg, Erez last_name: Berg citation: ama: 'Ghazaryan A, Holder T, Serbyn M, Berg E. Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene. Physical Review Letters. 2021;127(24). doi:10.1103/physrevlett.127.247001' apa: 'Ghazaryan, A., Holder, T., Serbyn, M., & Berg, E. (2021). Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene. Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.127.247001' chicago: 'Ghazaryan, Areg, Tobias Holder, Maksym Serbyn, and Erez Berg. “Unconventional Superconductivity in Systems with Annular Fermi Surfaces: Application to Rhombohedral Trilayer Graphene.” Physical Review Letters. American Physical Society, 2021. https://doi.org/10.1103/physrevlett.127.247001.' ieee: 'A. Ghazaryan, T. Holder, M. Serbyn, and E. Berg, “Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene,” Physical Review Letters, vol. 127, no. 24. American Physical Society, 2021.' ista: 'Ghazaryan A, Holder T, Serbyn M, Berg E. 2021. Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene. Physical Review Letters. 127(24), 247001.' mla: 'Ghazaryan, Areg, et al. “Unconventional Superconductivity in Systems with Annular Fermi Surfaces: Application to Rhombohedral Trilayer Graphene.” Physical Review Letters, vol. 127, no. 24, 247001, American Physical Society, 2021, doi:10.1103/physrevlett.127.247001.' short: A. Ghazaryan, T. Holder, M. Serbyn, E. Berg, Physical Review Letters 127 (2021). date_created: 2021-12-10T07:51:33Z date_published: 2021-12-09T00:00:00Z date_updated: 2023-08-14T13:19:13Z day: '09' department: - _id: MaSe doi: 10.1103/physrevlett.127.247001 ec_funded: 1 external_id: arxiv: - '2109.00011' isi: - '000923819400004' intvolume: ' 127' isi: 1 issue: '24' keyword: - general physics and astronomy language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2109.00011 month: '12' oa: 1 oa_version: Preprint project: - _id: 260C2330-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '754411' name: ISTplus - Postdoctoral Fellowships publication: Physical Review Letters publication_identifier: eissn: - 1079-7114 issn: - 0031-9007 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: link: - description: News on IST Webpage relation: press_release url: https://ist.ac.at/en/news/resolving-the-puzzles-of-graphene-superconductivity/ scopus_import: '1' status: public title: 'Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene' type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 127 year: '2021' ... --- _id: '10545' abstract: - lang: eng text: Classical models with complex energy landscapes represent a perspective avenue for the near-term application of quantum simulators. Until now, many theoretical works studied the performance of quantum algorithms for models with a unique ground state. However, when the classical problem is in a so-called clustering phase, the ground state manifold is highly degenerate. As an example, we consider a 3-XORSAT model defined on simple hypergraphs. The degeneracy of classical ground state manifold translates into the emergence of an extensive number of Z2 symmetries, which remain intact even in the presence of a quantum transverse magnetic field. We establish a general duality approach that restricts the quantum problem to a given sector of conserved Z2 charges and use it to study how the outcome of the quantum adiabatic algorithm depends on the hypergraph geometry. We show that the tree hypergraph which corresponds to a classically solvable instance of the 3-XORSAT problem features a constant gap, whereas the closed hypergraph encounters a second-order phase transition with a gap vanishing as a power-law in the problem size. The duality developed in this work provides a practical tool for studies of quantum models with classically degenerate energy manifold and reveals potential connections between glasses and gauge theories. acknowledgement: We would like to thank S. De Nicola, A. Michaidilis, T. Gulden, Y. Nez-Fernndez, P. Brighi, and S. Sack for fruitful discussions and valuable feedback on the manuscript. M.S. acknowledges useful discussions with E. Altman, L. Cugliandolo, and C. Laumann. We acknowledge support from the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Programme Grant Agreement No. 850899. article_number: '062423' article_processing_charge: No article_type: original author: - first_name: Raimel A full_name: Medina Ramos, Raimel A id: CE680B90-D85A-11E9-B684-C920E6697425 last_name: Medina Ramos orcid: 0000-0002-5383-2869 - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Medina Ramos RA, Serbyn M. Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT). Physical Review A. 2021;104(6). doi:10.1103/physreva.104.062423 apa: Medina Ramos, R. A., & Serbyn, M. (2021). Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT). Physical Review A. American Physical Society. https://doi.org/10.1103/physreva.104.062423 chicago: Medina Ramos, Raimel A, and Maksym Serbyn. “Duality Approach to Quantum Annealing of the 3-Variable Exclusive-or Satisfiability Problem (3-XORSAT).” Physical Review A. American Physical Society, 2021. https://doi.org/10.1103/physreva.104.062423. ieee: R. A. Medina Ramos and M. Serbyn, “Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT),” Physical Review A, vol. 104, no. 6. American Physical Society, 2021. ista: Medina Ramos RA, Serbyn M. 2021. Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT). Physical Review A. 104(6), 062423. mla: Medina Ramos, Raimel A., and Maksym Serbyn. “Duality Approach to Quantum Annealing of the 3-Variable Exclusive-or Satisfiability Problem (3-XORSAT).” Physical Review A, vol. 104, no. 6, 062423, American Physical Society, 2021, doi:10.1103/physreva.104.062423. short: R.A. Medina Ramos, M. Serbyn, Physical Review A 104 (2021). date_created: 2021-12-14T20:46:07Z date_published: 2021-12-14T00:00:00Z date_updated: 2023-08-17T06:22:49Z day: '14' department: - _id: MaSe doi: 10.1103/physreva.104.062423 ec_funded: 1 external_id: arxiv: - '2106.06344' isi: - '000753659200004' intvolume: ' 104' isi: 1 issue: '6' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2106.06344 month: '12' oa: 1 oa_version: Preprint project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 104 year: '2021' ... --- _id: '9048' abstract: - lang: eng text: The analogy between an equilibrium partition function and the return probability in many-body unitary dynamics has led to the concept of dynamical quantum phase transition (DQPT). DQPTs are defined by nonanalyticities in the return amplitude and are present in many models. In some cases, DQPTs can be related to equilibrium concepts, such as order parameters, yet their universal description is an open question. In this Letter, we provide first steps toward a classification of DQPTs by using a matrix product state description of unitary dynamics in the thermodynamic limit. This allows us to distinguish the two limiting cases of “precession” and “entanglement” DQPTs, which are illustrated using an analytical description in the quantum Ising model. While precession DQPTs are characterized by a large entanglement gap and are semiclassical in their nature, entanglement DQPTs occur near avoided crossings in the entanglement spectrum and can be distinguished by a complex pattern of nonlocal correlations. We demonstrate the existence of precession and entanglement DQPTs beyond Ising models, discuss observables that can distinguish them, and relate their interplay to complex DQPT phenomenology. acknowledgement: "S. D. N. acknowledges funding from the Institute of Science and Technology (IST) Austria and from the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Skłodowska-Curie Grant Agreement No. 754411. A. M. and M. S. were supported by the European Research Council (ERC) under the European Union’s Horizon 2020 Research and\r\nInnovation Programme (Grant Agreement No. 850899)." article_number: '040602' article_processing_charge: Yes article_type: original author: - first_name: Stefano full_name: De Nicola, Stefano id: 42832B76-F248-11E8-B48F-1D18A9856A87 last_name: De Nicola orcid: 0000-0002-4842-6671 - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis orcid: 0000-0002-8443-1064 - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: De Nicola S, Michailidis A, Serbyn M. Entanglement view of dynamical quantum phase transitions. Physical Review Letters. 2021;126(4). doi:10.1103/physrevlett.126.040602 apa: De Nicola, S., Michailidis, A., & Serbyn, M. (2021). Entanglement view of dynamical quantum phase transitions. Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.126.040602 chicago: De Nicola, Stefano, Alexios Michailidis, and Maksym Serbyn. “Entanglement View of Dynamical Quantum Phase Transitions.” Physical Review Letters. American Physical Society, 2021. https://doi.org/10.1103/physrevlett.126.040602. ieee: S. De Nicola, A. Michailidis, and M. Serbyn, “Entanglement view of dynamical quantum phase transitions,” Physical Review Letters, vol. 126, no. 4. American Physical Society, 2021. ista: De Nicola S, Michailidis A, Serbyn M. 2021. Entanglement view of dynamical quantum phase transitions. Physical Review Letters. 126(4), 040602. mla: De Nicola, Stefano, et al. “Entanglement View of Dynamical Quantum Phase Transitions.” Physical Review Letters, vol. 126, no. 4, 040602, American Physical Society, 2021, doi:10.1103/physrevlett.126.040602. short: S. De Nicola, A. Michailidis, M. Serbyn, Physical Review Letters 126 (2021). date_created: 2021-02-01T09:20:00Z date_published: 2021-01-29T00:00:00Z date_updated: 2023-09-05T12:08:58Z day: '29' ddc: - '530' department: - _id: MaSe doi: 10.1103/physrevlett.126.040602 ec_funded: 1 external_id: arxiv: - '2008.04894' isi: - '000613148200001' file: - access_level: open_access checksum: d9acbc502390ed7a97e631d23ae19ecd content_type: application/pdf creator: dernst date_created: 2021-02-03T12:47:04Z date_updated: 2021-02-03T12:47:04Z file_id: '9074' file_name: 2021_PhysicalRevLett_DeNicola.pdf file_size: 398075 relation: main_file success: 1 file_date_updated: 2021-02-03T12:47:04Z has_accepted_license: '1' intvolume: ' 126' isi: 1 issue: '4' keyword: - General Physics and Astronomy language: - iso: eng month: '01' oa: 1 oa_version: Published Version project: - _id: 260C2330-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '754411' name: ISTplus - Postdoctoral Fellowships - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review Letters publication_identifier: eissn: - 1079-7114 issn: - 0031-9007 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Entanglement view of dynamical quantum phase transitions tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 126 year: '2021' ... --- _id: '9760' abstract: - lang: eng text: "The quantum approximate optimization algorithm (QAOA) is a prospective near-term quantum algorithm due to its modest circuit depth and promising benchmarks. However, an external parameter optimization required in the QAOA could become a performance bottleneck. This motivates studies of the optimization landscape and search for heuristic ways of parameter initialization. In this work we visualize the optimization landscape of the QAOA applied to the MaxCut problem on random graphs, demonstrating that random initialization of the QAOA is prone to converging to local minima with suboptimal performance. We introduce the initialization of QAOA parameters based on the Trotterized quantum annealing (TQA) protocol, parameterized by the Trotter time step. We find that the TQA initialization allows to circumvent\r\nthe issue of false minima for a broad range of time steps, yielding the same performance as the best result out of an exponentially scaling number of random initializations. Moreover, we demonstrate that the optimal value of the time step coincides with the point of proliferation of Trotter errors in quantum annealing. Our results suggest practical ways of initializing QAOA protocols on near-term quantum devices and reveal new connections between QAOA and quantum annealing." acknowledgement: We would like to thank D. Abanin and R. Medina for fruitful discussions and A. Smith and I. Kim for valuable feedback on the manuscript. We acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). article_number: '491' article_processing_charge: Yes article_type: original author: - first_name: Stefan full_name: Sack, Stefan id: dd622248-f6e0-11ea-865d-ce382a1c81a5 last_name: Sack orcid: 0000-0001-5400-8508 - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Sack S, Serbyn M. Quantum annealing initialization of the quantum approximate optimization algorithm. Quantum. 2021;5. doi:10.22331/Q-2021-07-01-491 apa: Sack, S., & Serbyn, M. (2021). Quantum annealing initialization of the quantum approximate optimization algorithm. Quantum. Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften. https://doi.org/10.22331/Q-2021-07-01-491 chicago: Sack, Stefan, and Maksym Serbyn. “Quantum Annealing Initialization of the Quantum Approximate Optimization Algorithm.” Quantum. Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften, 2021. https://doi.org/10.22331/Q-2021-07-01-491. ieee: S. Sack and M. Serbyn, “Quantum annealing initialization of the quantum approximate optimization algorithm,” Quantum, vol. 5. Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften, 2021. ista: Sack S, Serbyn M. 2021. Quantum annealing initialization of the quantum approximate optimization algorithm. Quantum. 5, 491. mla: Sack, Stefan, and Maksym Serbyn. “Quantum Annealing Initialization of the Quantum Approximate Optimization Algorithm.” Quantum, vol. 5, 491, Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften, 2021, doi:10.22331/Q-2021-07-01-491. short: S. Sack, M. Serbyn, Quantum 5 (2021). date_created: 2021-08-01T22:01:21Z date_published: 2021-07-01T00:00:00Z date_updated: 2023-12-13T14:47:25Z day: '01' ddc: - '530' department: - _id: GradSch - _id: MaSe doi: 10.22331/Q-2021-07-01-491 ec_funded: 1 external_id: arxiv: - '2101.05742' isi: - '000669830600001' file: - access_level: open_access checksum: 9706c2bb8e748e9b5b138381995a7f6f content_type: application/pdf creator: cchlebak date_created: 2021-08-06T06:44:31Z date_updated: 2021-08-06T06:44:31Z file_id: '9774' file_name: 2021_Quantum_Sack.pdf file_size: 2312482 relation: main_file file_date_updated: 2021-08-06T06:44:31Z has_accepted_license: '1' intvolume: ' 5' isi: 1 language: - iso: eng month: '07' oa: 1 oa_version: Published Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Quantum publication_identifier: eissn: - 2521-327X publication_status: published publisher: Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften quality_controlled: '1' related_material: record: - id: '14622' relation: dissertation_contains status: public scopus_import: '1' status: public title: Quantum annealing initialization of the quantum approximate optimization algorithm tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 5 year: '2021' ... --- _id: '10029' abstract: - lang: eng text: Superconductor-semiconductor hybrids are platforms for realizing effective p-wave superconductivity. Spin-orbit coupling, combined with the proximity effect, causes the two-dimensional semiconductor to inherit p±ip intraband pairing, and application of magnetic field can then result in transitions to the normal state, partial Bogoliubov Fermi surfaces, or topological phases with Majorana modes. Experimentally probing the hybrid superconductor-semiconductor interface is challenging due to the shunting effect of the conventional superconductor. Consequently, the nature of induced pairing remains an open question. Here, we use the circuit quantum electrodynamics architecture to probe induced superconductivity in a two dimensional Al-InAs hybrid system. We observe a strong suppression of superfluid density and enhanced dissipation driven by magnetic field, which cannot be accounted for by the depairing theory of an s-wave superconductor. These observations are explained by a picture of independent intraband p±ip superconductors giving way to partial Bogoliubov Fermi surfaces, and allow for the first characterization of key properties of the hybrid superconducting system. acknowledged_ssus: - _id: M-Shop - _id: NanoFab acknowledgement: This research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication facility. JS and AG were supported by funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No.754411. article_number: '2107.03695' article_processing_charge: No author: - first_name: Duc T full_name: Phan, Duc T id: 29C8C0B4-F248-11E8-B48F-1D18A9856A87 last_name: Phan - first_name: Jorden L full_name: Senior, Jorden L id: 5479D234-2D30-11EA-89CC-40953DDC885E last_name: Senior orcid: 0000-0002-0672-9295 - first_name: Areg full_name: Ghazaryan, Areg id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87 last_name: Ghazaryan orcid: 0000-0001-9666-3543 - first_name: M. full_name: Hatefipour, M. last_name: Hatefipour - first_name: W. M. full_name: Strickland, W. M. last_name: Strickland - first_name: J. full_name: Shabani, J. last_name: Shabani - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Andrew P full_name: Higginbotham, Andrew P id: 4AD6785A-F248-11E8-B48F-1D18A9856A87 last_name: Higginbotham orcid: 0000-0003-2607-2363 citation: ama: Phan DT, Senior JL, Ghazaryan A, et al. Breakdown of induced p±ip pairing in a superconductor-semiconductor hybrid. arXiv. apa: Phan, D. T., Senior, J. L., Ghazaryan, A., Hatefipour, M., Strickland, W. M., Shabani, J., … Higginbotham, A. P. (n.d.). Breakdown of induced p±ip pairing in a superconductor-semiconductor hybrid. arXiv. chicago: Phan, Duc T, Jorden L Senior, Areg Ghazaryan, M. Hatefipour, W. M. Strickland, J. Shabani, Maksym Serbyn, and Andrew P Higginbotham. “Breakdown of Induced P±ip Pairing in a Superconductor-Semiconductor Hybrid.” ArXiv, n.d. ieee: D. T. Phan et al., “Breakdown of induced p±ip pairing in a superconductor-semiconductor hybrid,” arXiv. . ista: Phan DT, Senior JL, Ghazaryan A, Hatefipour M, Strickland WM, Shabani J, Serbyn M, Higginbotham AP. Breakdown of induced p±ip pairing in a superconductor-semiconductor hybrid. arXiv, 2107.03695. mla: Phan, Duc T., et al. “Breakdown of Induced P±ip Pairing in a Superconductor-Semiconductor Hybrid.” ArXiv, 2107.03695. short: D.T. Phan, J.L. Senior, A. Ghazaryan, M. Hatefipour, W.M. Strickland, J. Shabani, M. Serbyn, A.P. Higginbotham, ArXiv (n.d.). date_created: 2021-09-21T08:41:02Z date_published: 2021-07-08T00:00:00Z date_updated: 2024-02-21T12:36:52Z day: '08' department: - _id: MaSe - _id: AnHi - _id: MiLe ec_funded: 1 external_id: arxiv: - '2107.03695' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2107.03695 month: '07' oa: 1 oa_version: Preprint project: - _id: 260C2330-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '754411' name: ISTplus - Postdoctoral Fellowships publication: arXiv publication_status: submitted related_material: record: - id: '10851' relation: later_version status: public - id: '9636' relation: research_data status: public status: public title: Breakdown of induced p±ip pairing in a superconductor-semiconductor hybrid type: preprint user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2021' ... --- _id: '9428' abstract: - lang: eng text: Thermalization is the inevitable fate of many complex quantum systems, whose dynamics allow them to fully explore the vast configuration space regardless of the initial state---the behaviour known as quantum ergodicity. In a quest for experimental realizations of coherent long-time dynamics, efforts have focused on ergodicity-breaking mechanisms, such as integrability and localization. The recent discovery of persistent revivals in quantum simulators based on Rydberg atoms have pointed to the existence of a new type of behaviour where the system rapidly relaxes for most initial conditions, while certain initial states give rise to non-ergodic dynamics. This collective effect has been named ”quantum many-body scarring’by analogy with a related form of weak ergodicity breaking that occurs for a single particle inside a stadium billiard potential. In this Review, we provide a pedagogical introduction to quantum many-body scars and highlight the emerging connections with the semiclassical quantization of many-body systems. We discuss the relation between scars and more general routes towards weak violations of ergodicity due to embedded algebras and non-thermal eigenstates, and highlight possible applications of scars in quantum technology. acknowledgement: We thank our collaborators K. Bull, S. Choi, J.-Y. Desaules, W. W. Ho, A. Hudomal, M. Lukin, I. Martin, H. Pichler, N. Regnault, I. Vasić and in particular A. Michailidis and C. Turner, without whom this work would not have been possible. We also benefited from discussions with E. Altman, B. A. Bernevig, A. Chandran, P. Fendley, V. Khemani and L. Motrunich. M.S. was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 850899). D.A.A. was supported by the Swiss National Science Foundation and by the ERC under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 864597). Z.P. acknowledges support by the Leverhulme Trust Research Leadership Award RL-2019-015. article_processing_charge: No article_type: review author: - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Dmitry A. full_name: Abanin, Dmitry A. last_name: Abanin - first_name: Zlatko full_name: Papić, Zlatko last_name: Papić citation: ama: Serbyn M, Abanin DA, Papić Z. Quantum many-body scars and weak breaking of ergodicity. Nature Physics. 2021;17(6):675–685. doi:10.1038/s41567-021-01230-2 apa: Serbyn, M., Abanin, D. A., & Papić, Z. (2021). Quantum many-body scars and weak breaking of ergodicity. Nature Physics. Nature Research. https://doi.org/10.1038/s41567-021-01230-2 chicago: Serbyn, Maksym, Dmitry A. Abanin, and Zlatko Papić. “Quantum Many-Body Scars and Weak Breaking of Ergodicity.” Nature Physics. Nature Research, 2021. https://doi.org/10.1038/s41567-021-01230-2. ieee: M. Serbyn, D. A. Abanin, and Z. Papić, “Quantum many-body scars and weak breaking of ergodicity,” Nature Physics, vol. 17, no. 6. Nature Research, pp. 675–685, 2021. ista: Serbyn M, Abanin DA, Papić Z. 2021. Quantum many-body scars and weak breaking of ergodicity. Nature Physics. 17(6), 675–685. mla: Serbyn, Maksym, et al. “Quantum Many-Body Scars and Weak Breaking of Ergodicity.” Nature Physics, vol. 17, no. 6, Nature Research, 2021, pp. 675–685, doi:10.1038/s41567-021-01230-2. short: M. Serbyn, D.A. Abanin, Z. Papić, Nature Physics 17 (2021) 675–685. date_created: 2021-05-28T09:03:50Z date_published: 2021-06-01T00:00:00Z date_updated: 2023-10-18T08:20:59Z day: '01' ddc: - '539' department: - _id: MaSe doi: 10.1038/s41567-021-01230-2 ec_funded: 1 external_id: arxiv: - '2011.09486' isi: - '000655563800002' file: - access_level: open_access checksum: 316ed42ea1b42b0f1a3025bb476266fc content_type: application/pdf creator: patrickd date_created: 2021-09-20T09:27:43Z date_updated: 2021-12-02T23:30:03Z embargo: 2021-12-01 file_id: '10026' file_name: RevisedQMBSreview.pdf file_size: 10028836 relation: main_file file_date_updated: 2021-12-02T23:30:03Z has_accepted_license: '1' intvolume: ' 17' isi: 1 issue: '6' language: - iso: eng month: '06' oa: 1 oa_version: Preprint page: 675–685 project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Nature Physics publication_identifier: eissn: - 1745-2481 publication_status: published publisher: Nature Research quality_controlled: '1' status: public title: Quantum many-body scars and weak breaking of ergodicity type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 17 year: '2021' ... --- _id: '8011' abstract: - lang: eng text: 'Relaxation to a thermal state is the inevitable fate of nonequilibrium interacting quantum systems without special conservation laws. While thermalization in one-dimensional systems can often be suppressed by integrability mechanisms, in two spatial dimensions thermalization is expected to be far more effective due to the increased phase space. In this work we propose a general framework for escaping or delaying the emergence of the thermal state in two-dimensional arrays of Rydberg atoms via the mechanism of quantum scars, i.e., initial states that fail to thermalize. The suppression of thermalization is achieved in two complementary ways: by adding local perturbations or by adjusting the driving Rabi frequency according to the local connectivity of the lattice. We demonstrate that these mechanisms allow us to realize robust quantum scars in various two-dimensional lattices, including decorated lattices with nonconstant connectivity. In particular, we show that a small decrease of the Rabi frequency at the corners of the lattice is crucial for mitigating the strong boundary effects in two-dimensional systems. Our results identify synchronization as an important tool for future experiments on two-dimensional quantum scars.' article_number: '022065' article_processing_charge: No article_type: original author: - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis - first_name: C. J. full_name: Turner, C. J. last_name: Turner - first_name: Z. full_name: Papić, Z. last_name: Papić - first_name: D. A. full_name: Abanin, D. A. last_name: Abanin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Michailidis A, Turner CJ, Papić Z, Abanin DA, Serbyn M. Stabilizing two-dimensional quantum scars by deformation and synchronization. Physical Review Research. 2020;2(2). doi:10.1103/physrevresearch.2.022065 apa: Michailidis, A., Turner, C. J., Papić, Z., Abanin, D. A., & Serbyn, M. (2020). Stabilizing two-dimensional quantum scars by deformation and synchronization. Physical Review Research. American Physical Society. https://doi.org/10.1103/physrevresearch.2.022065 chicago: Michailidis, Alexios, C. J. Turner, Z. Papić, D. A. Abanin, and Maksym Serbyn. “Stabilizing Two-Dimensional Quantum Scars by Deformation and Synchronization.” Physical Review Research. American Physical Society, 2020. https://doi.org/10.1103/physrevresearch.2.022065. ieee: A. Michailidis, C. J. Turner, Z. Papić, D. A. Abanin, and M. Serbyn, “Stabilizing two-dimensional quantum scars by deformation and synchronization,” Physical Review Research, vol. 2, no. 2. American Physical Society, 2020. ista: Michailidis A, Turner CJ, Papić Z, Abanin DA, Serbyn M. 2020. Stabilizing two-dimensional quantum scars by deformation and synchronization. Physical Review Research. 2(2), 022065. mla: Michailidis, Alexios, et al. “Stabilizing Two-Dimensional Quantum Scars by Deformation and Synchronization.” Physical Review Research, vol. 2, no. 2, 022065, American Physical Society, 2020, doi:10.1103/physrevresearch.2.022065. short: A. Michailidis, C.J. Turner, Z. Papić, D.A. Abanin, M. Serbyn, Physical Review Research 2 (2020). date_created: 2020-06-23T12:00:19Z date_published: 2020-06-22T00:00:00Z date_updated: 2021-01-12T08:16:30Z day: '22' ddc: - '530' department: - _id: MaSe doi: 10.1103/physrevresearch.2.022065 ec_funded: 1 file: - access_level: open_access checksum: e6959dc8220f14a008d1933858795e6d content_type: application/pdf creator: dernst date_created: 2020-06-29T14:41:27Z date_updated: 2020-07-14T12:48:08Z file_id: '8050' file_name: 2020_PhysicalReviewResearch_Michailidis.pdf file_size: 2066011 relation: main_file file_date_updated: 2020-07-14T12:48:08Z has_accepted_license: '1' intvolume: ' 2' issue: '2' language: - iso: eng month: '06' oa: 1 oa_version: Published Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review Research publication_identifier: issn: - 2643-1564 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Stabilizing two-dimensional quantum scars by deformation and synchronization tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 2 year: '2020' ... --- _id: '7570' abstract: - lang: eng text: The relaxation of few-body quantum systems can strongly depend on the initial state when the system’s semiclassical phase space is mixed; i.e., regions of chaotic motion coexist with regular islands. In recent years, there has been much effort to understand the process of thermalization in strongly interacting quantum systems that often lack an obvious semiclassical limit. The time-dependent variational principle (TDVP) allows one to systematically derive an effective classical (nonlinear) dynamical system by projecting unitary many-body dynamics onto a manifold of weakly entangled variational states. We demonstrate that such dynamical systems generally possess mixed phase space. When TDVP errors are small, the mixed phase space leaves a footprint on the exact dynamics of the quantum model. For example, when the system is initialized in a state belonging to a stable periodic orbit or the surrounding regular region, it exhibits persistent many-body quantum revivals. As a proof of principle, we identify new types of “quantum many-body scars,” i.e., initial states that lead to long-time oscillations in a model of interacting Rydberg atoms in one and two dimensions. Intriguingly, the initial states that give rise to most robust revivals are typically entangled states. On the other hand, even when TDVP errors are large, as in the thermalizing tilted-field Ising model, initializing the system in a regular region of phase space leads to a surprising slowdown of thermalization. Our work establishes TDVP as a method for identifying interacting quantum systems with anomalous dynamics in arbitrary dimensions. Moreover, the mixed phase space classical variational equations allow one to find slowly thermalizing initial conditions in interacting models. Our results shed light on a link between classical and quantum chaos, pointing toward possible extensions of the classical Kolmogorov-Arnold-Moser theorem to quantum systems. article_number: '011055' article_processing_charge: No article_type: original author: - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis orcid: 0000-0002-8443-1064 - first_name: C. J. full_name: Turner, C. J. last_name: Turner - first_name: Z. full_name: Papić, Z. last_name: Papić - first_name: D. A. full_name: Abanin, D. A. last_name: Abanin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Michailidis A, Turner CJ, Papić Z, Abanin DA, Serbyn M. Slow quantum thermalization and many-body revivals from mixed phase space. Physical Review X. 2020;10(1). doi:10.1103/physrevx.10.011055 apa: Michailidis, A., Turner, C. J., Papić, Z., Abanin, D. A., & Serbyn, M. (2020). Slow quantum thermalization and many-body revivals from mixed phase space. Physical Review X. American Physical Society. https://doi.org/10.1103/physrevx.10.011055 chicago: Michailidis, Alexios, C. J. Turner, Z. Papić, D. A. Abanin, and Maksym Serbyn. “Slow Quantum Thermalization and Many-Body Revivals from Mixed Phase Space.” Physical Review X. American Physical Society, 2020. https://doi.org/10.1103/physrevx.10.011055. ieee: A. Michailidis, C. J. Turner, Z. Papić, D. A. Abanin, and M. Serbyn, “Slow quantum thermalization and many-body revivals from mixed phase space,” Physical Review X, vol. 10, no. 1. American Physical Society, 2020. ista: Michailidis A, Turner CJ, Papić Z, Abanin DA, Serbyn M. 2020. Slow quantum thermalization and many-body revivals from mixed phase space. Physical Review X. 10(1), 011055. mla: Michailidis, Alexios, et al. “Slow Quantum Thermalization and Many-Body Revivals from Mixed Phase Space.” Physical Review X, vol. 10, no. 1, 011055, American Physical Society, 2020, doi:10.1103/physrevx.10.011055. short: A. Michailidis, C.J. Turner, Z. Papić, D.A. Abanin, M. Serbyn, Physical Review X 10 (2020). date_created: 2020-03-08T18:02:01Z date_published: 2020-03-04T00:00:00Z date_updated: 2023-08-18T07:01:07Z day: '04' ddc: - '530' department: - _id: MaSe doi: 10.1103/physrevx.10.011055 external_id: arxiv: - '1905.08564' isi: - '000517969300001' file: - access_level: open_access checksum: 4b3f2c13873d35230173c73d0e11c408 content_type: application/pdf creator: dernst date_created: 2020-03-12T12:13:07Z date_updated: 2020-07-14T12:48:00Z file_id: '7581' file_name: 2020_PhysicalReviewX_Michailidis.pdf file_size: 17828638 relation: main_file file_date_updated: 2020-07-14T12:48:00Z has_accepted_license: '1' intvolume: ' 10' isi: 1 issue: '1' language: - iso: eng month: '03' oa: 1 oa_version: Published Version publication: Physical Review X publication_identifier: issn: - 2160-3308 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: link: - description: News on IST Homepage relation: press_release url: https://ist.ac.at/en/news/classical-physics-helps-predict-fate-of-interacting-quantum-systems/ scopus_import: '1' status: public title: Slow quantum thermalization and many-body revivals from mixed phase space tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 10 year: '2020' ... --- _id: '8308' abstract: - lang: eng text: 'Many-body localization provides a mechanism to avoid thermalization in isolated interacting quantum systems. The breakdown of thermalization may be complete, when all eigenstates in the many-body spectrum become localized, or partial, when the so-called many-body mobility edge separates localized and delocalized parts of the spectrum. Previously, De Roeck et al. [Phys. Rev. B 93, 014203 (2016)] suggested a possible instability of the many-body mobility edge in energy density. The local ergodic regions—so-called “bubbles”—resonantly spread throughout the system, leading to delocalization. In order to study such instability mechanism, in this work we design a model featuring many-body mobility edge in particle density: the states at small particle density are localized, while increasing the density of particles leads to delocalization. Using numerical simulations with matrix product states, we demonstrate the stability of many-body localization with respect to small bubbles in large dilute systems for experimentally relevant timescales. In addition, we demonstrate that processes where the bubble spreads are favored over processes that lead to resonant tunneling, suggesting a possible mechanism behind the observed stability of many-body mobility edge. We conclude by proposing experiments to probe particle density mobility edge in the Bose-Hubbard model.' acknowledgement: 'Acknowledgments. We acknowledge useful discussions with W. De Roeck and A. Michailidis. P.B. was supported by the European Union''s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No. 665385. D.A. was supported by the Swiss National Science Foundation. M.S. was supported by European Research Council (ERC) under the European Union''s Horizon 2020 research and innovation program (Grant Agreement No. 850899). This work benefited from visits to KITP, supported by the National Science Foundation under Grant No. NSF PHY-1748958 and from the program “Thermalization, Many Body Localization and Hydrodynamics” at International Centre for Theoretical Sciences (Code: ICTS/hydrodynamics2019/11).' article_number: 060202(R) article_processing_charge: No article_type: original author: - first_name: Pietro full_name: Brighi, Pietro id: 4115AF5C-F248-11E8-B48F-1D18A9856A87 last_name: Brighi orcid: 0000-0002-7969-2729 - first_name: Dmitry A. full_name: Abanin, Dmitry A. last_name: Abanin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Brighi P, Abanin DA, Serbyn M. Stability of mobility edges in disordered interacting systems. Physical Review B. 2020;102(6). doi:10.1103/physrevb.102.060202 apa: Brighi, P., Abanin, D. A., & Serbyn, M. (2020). Stability of mobility edges in disordered interacting systems. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.102.060202 chicago: Brighi, Pietro, Dmitry A. Abanin, and Maksym Serbyn. “Stability of Mobility Edges in Disordered Interacting Systems.” Physical Review B. American Physical Society, 2020. https://doi.org/10.1103/physrevb.102.060202. ieee: P. Brighi, D. A. Abanin, and M. Serbyn, “Stability of mobility edges in disordered interacting systems,” Physical Review B, vol. 102, no. 6. American Physical Society, 2020. ista: Brighi P, Abanin DA, Serbyn M. 2020. Stability of mobility edges in disordered interacting systems. Physical Review B. 102(6), 060202(R). mla: Brighi, Pietro, et al. “Stability of Mobility Edges in Disordered Interacting Systems.” Physical Review B, vol. 102, no. 6, 060202(R), American Physical Society, 2020, doi:10.1103/physrevb.102.060202. short: P. Brighi, D.A. Abanin, M. Serbyn, Physical Review B 102 (2020). date_created: 2020-08-26T19:27:42Z date_published: 2020-08-26T00:00:00Z date_updated: 2023-08-24T14:20:21Z day: '26' ddc: - '530' department: - _id: MaSe doi: 10.1103/physrevb.102.060202 ec_funded: 1 external_id: isi: - '000562628300001' file: - access_level: open_access checksum: 716442fa7861323fcc80b93718ca009c content_type: application/pdf creator: mserbyn date_created: 2020-08-26T19:28:55Z date_updated: 2020-08-26T19:28:55Z file_id: '8309' file_name: PhysRevB.102.060202.pdf file_size: 488825 relation: main_file success: 1 - access_level: open_access checksum: be0abdc8f60fe065ea6dc92e08487122 content_type: application/pdf creator: mserbyn date_created: 2020-08-26T19:29:00Z date_updated: 2020-08-26T19:29:00Z file_id: '8310' file_name: Supplementary-mbme.pdf file_size: 711405 relation: main_file success: 1 file_date_updated: 2020-08-26T19:29:00Z has_accepted_license: '1' intvolume: ' 102' isi: 1 issue: '6' language: - iso: eng month: '08' oa: 1 oa_version: None project: - _id: 2564DBCA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '665385' name: International IST Doctoral Program - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: record: - id: '12732' relation: dissertation_contains status: public scopus_import: '1' status: public title: Stability of mobility edges in disordered interacting systems type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 102 year: '2020' ... --- _id: '7971' abstract: - lang: eng text: Multilayer graphene lattices allow for an additional tunability of the band structure by the strong perpendicular electric field. In particular, the emergence of the new multiple Dirac points in ABA stacked trilayer graphene subject to strong transverse electric fields was proposed theoretically and confirmed experimentally. These new Dirac points dubbed “gullies” emerge from the interplay between strong electric field and trigonal warping. In this work, we first characterize the properties of new emergent Dirac points and show that the electric field can be used to tune the distance between gullies in the momentum space. We demonstrate that the band structure has multiple Lifshitz transitions and higher-order singularity of “monkey saddle” type. Following the characterization of the band structure, we consider the spectrum of Landau levels and structure of their wave functions. In the limit of strong electric fields when gullies are well separated in momentum space, they give rise to triply degenerate Landau levels. In the second part of this work, we investigate how degeneracy between three gully Landau levels is lifted in the presence of interactions. Within the Hartree-Fock approximation we show that the symmetry breaking state interpolates between the fully gully polarized state that breaks C3 symmetry at high displacement field and the gully symmetric state when the electric field is decreased. The discontinuous transition between these two states is driven by enhanced intergully tunneling and exchange. We conclude by outlining specific experimental predictions for the existence of such a symmetry-breaking state. article_number: '245411' article_processing_charge: No article_type: original author: - first_name: Peng full_name: Rao, Peng id: 47C23AC6-02D0-11E9-BD0E-99399A5D3DEB last_name: Rao orcid: 0000-0003-1250-0021 - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Rao P, Serbyn M. Gully quantum Hall ferromagnetism in biased trilayer graphene. Physical Review B. 2020;101(24). doi:10.1103/physrevb.101.245411 apa: Rao, P., & Serbyn, M. (2020). Gully quantum Hall ferromagnetism in biased trilayer graphene. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.101.245411 chicago: Rao, Peng, and Maksym Serbyn. “Gully Quantum Hall Ferromagnetism in Biased Trilayer Graphene.” Physical Review B. American Physical Society, 2020. https://doi.org/10.1103/physrevb.101.245411. ieee: P. Rao and M. Serbyn, “Gully quantum Hall ferromagnetism in biased trilayer graphene,” Physical Review B, vol. 101, no. 24. American Physical Society, 2020. ista: Rao P, Serbyn M. 2020. Gully quantum Hall ferromagnetism in biased trilayer graphene. Physical Review B. 101(24), 245411. mla: Rao, Peng, and Maksym Serbyn. “Gully Quantum Hall Ferromagnetism in Biased Trilayer Graphene.” Physical Review B, vol. 101, no. 24, 245411, American Physical Society, 2020, doi:10.1103/physrevb.101.245411. short: P. Rao, M. Serbyn, Physical Review B 101 (2020). date_created: 2020-06-17T14:52:06Z date_published: 2020-06-15T00:00:00Z date_updated: 2023-09-05T12:11:37Z day: '15' department: - _id: MaSe doi: 10.1103/physrevb.101.245411 external_id: isi: - '000538715500010' intvolume: ' 101' isi: 1 issue: '24' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2002.05739 month: '06' oa: 1 oa_version: Preprint publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Gully quantum Hall ferromagnetism in biased trilayer graphene type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 101 year: '2020' ... --- _id: '6477' abstract: - lang: eng text: 'Thermalizing quantum systems are conventionallydescribed by statistical mechanics at equilib-rium. However, not all systems fall into this category, with many-body localization providinga generic mechanism for thermalization to fail in strongly disordered systems. Many-bodylocalized (MBL) systems remain perfect insulators at nonzero temperature, which do notthermalize and therefore cannot be describedusing statistical mechanics. This Colloquiumreviews recent theoretical and experimental advances in studies of MBL systems, focusing onthe new perspective provided by entanglement and nonequilibrium experimental probes suchas quantum quenches. Theoretically, MBL systems exhibit a new kind of robust integrability: anextensive set of quasilocal integrals of motion emerges, which provides an intuitive explanationof the breakdown of thermalization. A description based on quasilocal integrals of motion isused to predict dynamical properties of MBL systems, such as the spreading of quantumentanglement, the behavior of local observables, and the response to external dissipativeprocesses. Furthermore, MBL systems can exhibit eigenstate transitions and quantum ordersforbidden in thermodynamic equilibrium. An outline isgiven of the current theoretical under-standing of the quantum-to-classical transitionbetween many-body localized and ergodic phasesand anomalous transport in the vicinity of that transition. Experimentally, synthetic quantumsystems, which are well isolated from an external thermal reservoir, provide natural platforms forrealizing the MBL phase. Recent experiments with ultracold atoms, trapped ions, superconductingqubits, and quantum materials, in which different signatures of many-body localization have beenobserved, are reviewed. This Colloquium concludes by listing outstanding challenges andpromising future research directions.' article_number: '021001' article_processing_charge: No article_type: original author: - first_name: Dmitry A. full_name: Abanin, Dmitry A. last_name: Abanin - first_name: Ehud full_name: Altman, Ehud last_name: Altman - first_name: Immanuel full_name: Bloch, Immanuel last_name: Bloch - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: 'Abanin DA, Altman E, Bloch I, Serbyn M. Colloquium: Many-body localization, thermalization, and entanglement. Reviews of Modern Physics. 2019;91(2). doi:10.1103/revmodphys.91.021001' apa: 'Abanin, D. A., Altman, E., Bloch, I., & Serbyn, M. (2019). Colloquium: Many-body localization, thermalization, and entanglement. Reviews of Modern Physics. American Physical Society. https://doi.org/10.1103/revmodphys.91.021001' chicago: 'Abanin, Dmitry A., Ehud Altman, Immanuel Bloch, and Maksym Serbyn. “Colloquium: Many-Body Localization, Thermalization, and Entanglement.” Reviews of Modern Physics. American Physical Society, 2019. https://doi.org/10.1103/revmodphys.91.021001.' ieee: 'D. A. Abanin, E. Altman, I. Bloch, and M. Serbyn, “Colloquium: Many-body localization, thermalization, and entanglement,” Reviews of Modern Physics, vol. 91, no. 2. American Physical Society, 2019.' ista: 'Abanin DA, Altman E, Bloch I, Serbyn M. 2019. Colloquium: Many-body localization, thermalization, and entanglement. Reviews of Modern Physics. 91(2), 021001.' mla: 'Abanin, Dmitry A., et al. “Colloquium: Many-Body Localization, Thermalization, and Entanglement.” Reviews of Modern Physics, vol. 91, no. 2, 021001, American Physical Society, 2019, doi:10.1103/revmodphys.91.021001.' short: D.A. Abanin, E. Altman, I. Bloch, M. Serbyn, Reviews of Modern Physics 91 (2019). date_created: 2019-05-23T07:38:43Z date_published: 2019-05-22T00:00:00Z date_updated: 2023-08-25T10:37:56Z day: '22' ddc: - '530' department: - _id: MaSe doi: 10.1103/revmodphys.91.021001 external_id: arxiv: - '1804.11065' isi: - '000469046900001' file: - access_level: open_access checksum: 4aec0e6662b09f6e0f828cd30ff2c3a6 content_type: application/pdf creator: mserbyn date_created: 2019-05-23T07:39:05Z date_updated: 2020-07-14T12:47:31Z file_id: '6478' file_name: RevModPhys.91.021001.pdf file_size: 1695677 relation: main_file file_date_updated: 2020-07-14T12:47:31Z has_accepted_license: '1' intvolume: ' 91' isi: 1 issue: '2' language: - iso: eng month: '05' oa: 1 oa_version: Published Version publication: Reviews of Modern Physics publication_identifier: eissn: - 0034-6861 issn: - 1539-0756 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: 'Colloquium: Many-body localization, thermalization, and entanglement' type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 91 year: '2019' ... --- _id: '6174' abstract: - lang: eng text: We propose a scaling theory for the many-body localization (MBL) phase transition in one dimension, building on the idea that it proceeds via a “quantum avalanche.” We argue that the critical properties can be captured at a coarse-grained level by a Kosterlitz-Thouless (KT) renormalization group (RG) flow. On phenomenological grounds, we identify the scaling variables as the density of thermal regions and the length scale that controls the decay of typical matrix elements. Within this KT picture, the MBL phase is a line of fixed points that terminates at the delocalization transition. We discuss two possible scenarios distinguished by the distribution of rare, fractal thermal inclusions within the MBL phase. In the first scenario, these regions have a stretched exponential distribution in the MBL phase. In the second scenario, the near-critical MBL phase hosts rare thermal regions that are power-law-distributed in size. This points to the existence of a second transition within the MBL phase, at which these power laws change to the stretched exponential form expected at strong disorder. We numerically simulate two different phenomenological RGs previously proposed to describe the MBL transition. Both RGs display a universal power-law length distribution of thermal regions at the transition with a critical exponent αc=2, and continuously varying exponents in the MBL phase consistent with the KT picture. article_number: '094205' article_processing_charge: No article_type: original author: - first_name: Philipp T. full_name: Dumitrescu, Philipp T. last_name: Dumitrescu - first_name: Anna full_name: Goremykina, Anna last_name: Goremykina - first_name: Siddharth A. full_name: Parameswaran, Siddharth A. last_name: Parameswaran - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Romain full_name: Vasseur, Romain last_name: Vasseur citation: ama: Dumitrescu PT, Goremykina A, Parameswaran SA, Serbyn M, Vasseur R. Kosterlitz-Thouless scaling at many-body localization phase transitions. Physical Review B. 2019;99(9). doi:10.1103/physrevb.99.094205 apa: Dumitrescu, P. T., Goremykina, A., Parameswaran, S. A., Serbyn, M., & Vasseur, R. (2019). Kosterlitz-Thouless scaling at many-body localization phase transitions. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.99.094205 chicago: Dumitrescu, Philipp T., Anna Goremykina, Siddharth A. Parameswaran, Maksym Serbyn, and Romain Vasseur. “Kosterlitz-Thouless Scaling at Many-Body Localization Phase Transitions.” Physical Review B. American Physical Society, 2019. https://doi.org/10.1103/physrevb.99.094205. ieee: P. T. Dumitrescu, A. Goremykina, S. A. Parameswaran, M. Serbyn, and R. Vasseur, “Kosterlitz-Thouless scaling at many-body localization phase transitions,” Physical Review B, vol. 99, no. 9. American Physical Society, 2019. ista: Dumitrescu PT, Goremykina A, Parameswaran SA, Serbyn M, Vasseur R. 2019. Kosterlitz-Thouless scaling at many-body localization phase transitions. Physical Review B. 99(9), 094205. mla: Dumitrescu, Philipp T., et al. “Kosterlitz-Thouless Scaling at Many-Body Localization Phase Transitions.” Physical Review B, vol. 99, no. 9, 094205, American Physical Society, 2019, doi:10.1103/physrevb.99.094205. short: P.T. Dumitrescu, A. Goremykina, S.A. Parameswaran, M. Serbyn, R. Vasseur, Physical Review B 99 (2019). date_created: 2019-03-25T07:32:08Z date_published: 2019-03-22T00:00:00Z date_updated: 2023-09-05T12:11:13Z day: '22' department: - _id: MaSe doi: 10.1103/physrevb.99.094205 external_id: arxiv: - '1811.03103' isi: - '000462883200001' intvolume: ' 99' isi: 1 issue: '9' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1811.03103 month: '03' oa: 1 oa_version: Preprint publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Kosterlitz-Thouless scaling at many-body localization phase transitions type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 99 year: '2019' ... --- _id: '6575' abstract: - lang: eng text: Motivated by recent experimental observations of coherent many-body revivals in a constrained Rydbergatom chain, we construct a weak quasilocal deformation of the Rydberg-blockaded Hamiltonian, whichmakes the revivals virtually perfect. Our analysis suggests the existence of an underlying nonintegrableHamiltonian which supports an emergent SU(2)-spin dynamics within a small subspace of the many-bodyHilbert space. We show that such perfect dynamics necessitates the existence of atypical, nonergodicenergy eigenstates—quantum many-body scars. Furthermore, using these insights, we construct a toymodel that hosts exact quantum many-body scars, providing an intuitive explanation of their origin. Ourresults offer specific routes to enhancing coherent many-body revivals and provide a step towardestablishing the stability of quantum many-body scars in the thermodynamic limit. article_number: '220603' article_processing_charge: No article_type: original author: - first_name: Soonwon full_name: Choi, Soonwon last_name: Choi - first_name: Christopher J. full_name: Turner, Christopher J. last_name: Turner - first_name: Hannes full_name: Pichler, Hannes last_name: Pichler - first_name: Wen Wei full_name: Ho, Wen Wei last_name: Ho - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis orcid: 0000-0002-8443-1064 - first_name: Zlatko full_name: Papić, Zlatko last_name: Papić - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Mikhail D. full_name: Lukin, Mikhail D. last_name: Lukin - first_name: Dmitry A. full_name: Abanin, Dmitry A. last_name: Abanin citation: ama: Choi S, Turner CJ, Pichler H, et al. Emergent SU(2) dynamics and perfect quantum many-body scars. Physical Review Letters. 2019;122(22). doi:10.1103/PhysRevLett.122.220603 apa: Choi, S., Turner, C. J., Pichler, H., Ho, W. W., Michailidis, A., Papić, Z., … Abanin, D. A. (2019). Emergent SU(2) dynamics and perfect quantum many-body scars. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.122.220603 chicago: Choi, Soonwon, Christopher J. Turner, Hannes Pichler, Wen Wei Ho, Alexios Michailidis, Zlatko Papić, Maksym Serbyn, Mikhail D. Lukin, and Dmitry A. Abanin. “Emergent SU(2) Dynamics and Perfect Quantum Many-Body Scars.” Physical Review Letters. American Physical Society, 2019. https://doi.org/10.1103/PhysRevLett.122.220603. ieee: S. Choi et al., “Emergent SU(2) dynamics and perfect quantum many-body scars,” Physical Review Letters, vol. 122, no. 22. American Physical Society, 2019. ista: Choi S, Turner CJ, Pichler H, Ho WW, Michailidis A, Papić Z, Serbyn M, Lukin MD, Abanin DA. 2019. Emergent SU(2) dynamics and perfect quantum many-body scars. Physical Review Letters. 122(22), 220603. mla: Choi, Soonwon, et al. “Emergent SU(2) Dynamics and Perfect Quantum Many-Body Scars.” Physical Review Letters, vol. 122, no. 22, 220603, American Physical Society, 2019, doi:10.1103/PhysRevLett.122.220603. short: S. Choi, C.J. Turner, H. Pichler, W.W. Ho, A. Michailidis, Z. Papić, M. Serbyn, M.D. Lukin, D.A. Abanin, Physical Review Letters 122 (2019). date_created: 2019-06-23T21:59:13Z date_published: 2019-06-07T00:00:00Z date_updated: 2024-02-28T13:12:22Z day: '07' department: - _id: MaSe doi: 10.1103/PhysRevLett.122.220603 external_id: arxiv: - '1812.05561' isi: - '000470885800005' intvolume: ' 122' isi: 1 issue: '22' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1812.05561 month: '06' oa: 1 oa_version: Preprint publication: Physical Review Letters publication_identifier: eissn: - '10797114' issn: - '00319007' publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Emergent SU(2) dynamics and perfect quantum many-body scars type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 122 year: '2019' ... --- _id: '7013' abstract: - lang: eng text: Chains of superconducting circuit devices provide a natural platform for studies of synthetic bosonic quantum matter. Motivated by the recent experimental progress in realizing disordered and interacting chains of superconducting transmon devices, we study the bosonic many-body localization phase transition using the methods of exact diagonalization as well as matrix product state dynamics. We estimate the location of transition separating the ergodic and the many-body localized phases as a function of the disorder strength and the many-body on-site interaction strength. The main difference between the bosonic model realized by superconducting circuits and similar fermionic model is that the effect of the on-site interaction is stronger due to the possibility of multiple excitations occupying the same site. The phase transition is found to be robust upon including longer-range hopping and interaction terms present in the experiments. Furthermore, we calculate experimentally relevant local observables and show that their temporal fluctuations can be used to distinguish between the dynamics of Anderson insulator, many-body localization, and delocalized phases. While we consider unitary dynamics, neglecting the effects of dissipation, decoherence, and measurement back action, the timescales on which the dynamics is unitary are sufficient for observation of characteristic dynamics in the many-body localized phase. Moreover, the experimentally available disorder strength and interactions allow for tuning the many-body localization phase transition, thus making the arrays of superconducting circuit devices a promising platform for exploring localization physics and phase transition. article_number: '134504' article_processing_charge: No article_type: original author: - first_name: Tuure full_name: Orell, Tuure last_name: Orell - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis orcid: 0000-0002-8443-1064 - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Matti full_name: Silveri, Matti last_name: Silveri citation: ama: Orell T, Michailidis A, Serbyn M, Silveri M. Probing the many-body localization phase transition with superconducting circuits. Physical Review B. 2019;100(13). doi:10.1103/physrevb.100.134504 apa: Orell, T., Michailidis, A., Serbyn, M., & Silveri, M. (2019). Probing the many-body localization phase transition with superconducting circuits. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.100.134504 chicago: Orell, Tuure, Alexios Michailidis, Maksym Serbyn, and Matti Silveri. “Probing the Many-Body Localization Phase Transition with Superconducting Circuits.” Physical Review B. American Physical Society, 2019. https://doi.org/10.1103/physrevb.100.134504. ieee: T. Orell, A. Michailidis, M. Serbyn, and M. Silveri, “Probing the many-body localization phase transition with superconducting circuits,” Physical Review B, vol. 100, no. 13. American Physical Society, 2019. ista: Orell T, Michailidis A, Serbyn M, Silveri M. 2019. Probing the many-body localization phase transition with superconducting circuits. Physical Review B. 100(13), 134504. mla: Orell, Tuure, et al. “Probing the Many-Body Localization Phase Transition with Superconducting Circuits.” Physical Review B, vol. 100, no. 13, 134504, American Physical Society, 2019, doi:10.1103/physrevb.100.134504. short: T. Orell, A. Michailidis, M. Serbyn, M. Silveri, Physical Review B 100 (2019). date_created: 2019-11-13T08:25:48Z date_published: 2019-10-01T00:00:00Z date_updated: 2024-02-28T13:13:13Z day: '01' department: - _id: MaSe doi: 10.1103/physrevb.100.134504 external_id: arxiv: - '1907.04043' isi: - '000489036500004' intvolume: ' 100' isi: 1 issue: '13' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1907.04043 month: '10' oa: 1 oa_version: Preprint publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Probing the many-body localization phase transition with superconducting circuits type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 100 year: '2019' ... --- _id: '5906' abstract: - lang: eng text: We introduce a simple, exactly solvable strong-randomness renormalization group (RG) model for the many-body localization (MBL) transition in one dimension. Our approach relies on a family of RG flows parametrized by the asymmetry between thermal and localized phases. We identify the physical MBL transition in the limit of maximal asymmetry, reflecting the instability of MBL against rare thermal inclusions. We find a critical point that is localized with power-law distributed thermal inclusions. The typical size of critical inclusions remains finite at the transition, while the average size is logarithmically diverging. We propose a two-parameter scaling theory for the many-body localization transition that falls into the Kosterlitz-Thouless universality class, with the MBL phase corresponding to a stable line of fixed points with multifractal behavior. article_number: '040601' article_processing_charge: No article_type: original author: - first_name: Anna full_name: Goremykina, Anna last_name: Goremykina - first_name: Romain full_name: Vasseur, Romain last_name: Vasseur - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Goremykina A, Vasseur R, Serbyn M. Analytically solvable renormalization group for the many-body localization transition. Physical Review Letters. 2019;122(4). doi:10.1103/physrevlett.122.040601 apa: Goremykina, A., Vasseur, R., & Serbyn, M. (2019). Analytically solvable renormalization group for the many-body localization transition. Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.122.040601 chicago: Goremykina, Anna, Romain Vasseur, and Maksym Serbyn. “Analytically Solvable Renormalization Group for the Many-Body Localization Transition.” Physical Review Letters. American Physical Society, 2019. https://doi.org/10.1103/physrevlett.122.040601. ieee: A. Goremykina, R. Vasseur, and M. Serbyn, “Analytically solvable renormalization group for the many-body localization transition,” Physical Review Letters, vol. 122, no. 4. American Physical Society, 2019. ista: Goremykina A, Vasseur R, Serbyn M. 2019. Analytically solvable renormalization group for the many-body localization transition. Physical Review Letters. 122(4), 040601. mla: Goremykina, Anna, et al. “Analytically Solvable Renormalization Group for the Many-Body Localization Transition.” Physical Review Letters, vol. 122, no. 4, 040601, American Physical Society, 2019, doi:10.1103/physrevlett.122.040601. short: A. Goremykina, R. Vasseur, M. Serbyn, Physical Review Letters 122 (2019). date_created: 2019-02-01T08:22:28Z date_published: 2019-02-01T00:00:00Z date_updated: 2024-02-28T13:13:38Z day: '01' department: - _id: MaSe doi: 10.1103/physrevlett.122.040601 external_id: arxiv: - '1807.04285' isi: - '000456783700001' intvolume: ' 122' isi: 1 issue: '4' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1807.04285 month: '02' oa: 1 oa_version: Preprint publication: Physical Review Letters publication_identifier: eissn: - 1079-7114 issn: - 0031-9007 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Analytically solvable renormalization group for the many-body localization transition type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 122 year: '2019' ... --- _id: '46' abstract: - lang: eng text: We analyze a disordered central spin model, where a central spin interacts equally with each spin in a periodic one-dimensional (1D) random-field Heisenberg chain. If the Heisenberg chain is initially in the many-body localized (MBL) phase, we find that the coupling to the central spin suffices to delocalize the chain for a substantial range of coupling strengths. We calculate the phase diagram of the model and identify the phase boundary between the MBL and ergodic phase. Within the localized phase, the central spin significantly enhances the rate of the logarithmic entanglement growth and its saturation value. We attribute the increase in entanglement entropy to a nonextensive enhancement of magnetization fluctuations induced by the central spin. Finally, we demonstrate that correlation functions of the central spin can be utilized to distinguish between MBL and ergodic phases of the 1D chain. Hence, we propose the use of a central spin as a possible experimental probe to identify the MBL phase. acknowledgement: F.P. acknowledges the sup- port of the DFG Research Unit FOR 1807 through Grants No. PO 1370/2-1 and No. TRR80, the Nanosystems Initiative Munich (NIM) by the German Excellence Initiative, and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 771537). N.Y.Y. acknowledges support from the NSF (PHY-1654740), the ARO STIR program, and a Google research award. article_number: '161122' article_processing_charge: No article_type: original author: - first_name: Daniel full_name: Hetterich, Daniel last_name: Hetterich - first_name: Norman full_name: Yao, Norman last_name: Yao - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Frank full_name: Pollmann, Frank last_name: Pollmann - first_name: Björn full_name: Trauzettel, Björn last_name: Trauzettel citation: ama: Hetterich D, Yao N, Serbyn M, Pollmann F, Trauzettel B. Detection and characterization of many-body localization in central spin models. Physical Review B. 2018;98(16). doi:10.1103/PhysRevB.98.161122 apa: Hetterich, D., Yao, N., Serbyn, M., Pollmann, F., & Trauzettel, B. (2018). Detection and characterization of many-body localization in central spin models. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.98.161122 chicago: Hetterich, Daniel, Norman Yao, Maksym Serbyn, Frank Pollmann, and Björn Trauzettel. “Detection and Characterization of Many-Body Localization in Central Spin Models.” Physical Review B. American Physical Society, 2018. https://doi.org/10.1103/PhysRevB.98.161122. ieee: D. Hetterich, N. Yao, M. Serbyn, F. Pollmann, and B. Trauzettel, “Detection and characterization of many-body localization in central spin models,” Physical Review B, vol. 98, no. 16. American Physical Society, 2018. ista: Hetterich D, Yao N, Serbyn M, Pollmann F, Trauzettel B. 2018. Detection and characterization of many-body localization in central spin models. Physical Review B. 98(16), 161122. mla: Hetterich, Daniel, et al. “Detection and Characterization of Many-Body Localization in Central Spin Models.” Physical Review B, vol. 98, no. 16, 161122, American Physical Society, 2018, doi:10.1103/PhysRevB.98.161122. short: D. Hetterich, N. Yao, M. Serbyn, F. Pollmann, B. Trauzettel, Physical Review B 98 (2018). date_created: 2018-12-11T11:44:20Z date_published: 2018-10-15T00:00:00Z date_updated: 2023-09-11T12:55:03Z day: '15' department: - _id: MaSe doi: 10.1103/PhysRevB.98.161122 external_id: arxiv: - '1806.08316' isi: - '000448596500002' intvolume: ' 98' isi: 1 issue: '16' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1806.08316 month: '10' oa: 1 oa_version: Preprint publication: Physical Review B publication_status: published publisher: American Physical Society publist_id: '8008' quality_controlled: '1' scopus_import: '1' status: public title: Detection and characterization of many-body localization in central spin models type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 98 year: '2018' ... --- _id: '289' abstract: - lang: eng text: We report on quantum capacitance measurements of high quality, graphite- and hexagonal boron nitride encapsulated Bernal stacked trilayer graphene devices. At zero applied magnetic field, we observe a number of electron density- and electrical displacement-tuned features in the electronic compressibility associated with changes in Fermi surface topology. At high displacement field and low density, strong trigonal warping gives rise to emergent Dirac gullies centered near the corners of the hexagonal Brillouin and related by three fold rotation symmetry. At low magnetic fields of B=1.25~T, the gullies manifest as a change in the degeneracy of the Landau levels from two to three. Weak incompressible states are also observed at integer filling within these triplets Landau levels, which a Hartree-Fock analysis indicates are associated with Coulomb-driven nematic phases that spontaneously break rotation symmetry. acknowledgement: The experimental work at UCSB was funded by the National Science Foundation under Grant No. DMR- 1654186. Work at Columbia was supported by the National Science Foundation under Grant No. DMR- 1507788. K. W. and T. T. acknowledge support from the Elemental Strategy Initiative conducted by the Ministry of Education, Culture, Sports, Science and Technology, Japan, and the Japan Society for the Promotion of Science KAKENHI Grant No. JP15K21722. E. M. S. acknowledges the support of the Elings Fellowship from the California Nanosystems Institute at the University of California, Santa Barbara. A. F. Y. acknowledges the support of the David and Lucile Packard foundation and the Sloan Foundation. Measurements made use of a dilution refrigerator funded through the Major Research Instrumentation program of the U.S. National Science Foundation under Grant No. DMR- 1531389, and the MRL Shared Experimental Facilities, which are supported by the MRSEC Program of the U.S. National Science Foundation under Grant No. DMR- 1720256. article_number: '167601' article_processing_charge: No article_type: original author: - first_name: Alexander full_name: Zibrov, Alexander last_name: Zibrov - first_name: Rao full_name: Peng, Rao id: 47C23AC6-02D0-11E9-BD0E-99399A5D3DEB last_name: Peng orcid: 0000-0003-1250-0021 - first_name: Carlos full_name: Kometter, Carlos last_name: Kometter - first_name: Jia full_name: Li, Jia last_name: Li - first_name: Cory full_name: Dean, Cory last_name: Dean - first_name: Takashi full_name: Taniguchi, Takashi last_name: Taniguchi - first_name: Kenji full_name: Watanabe, Kenji last_name: Watanabe - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Andrea full_name: Young, Andrea last_name: Young citation: ama: Zibrov A, Rao P, Kometter C, et al. Emergent dirac gullies and gully-symmetry-breaking quantum hall states in ABA trilayer graphene. Physical Review Letters. 2018;121(16). doi:10.1103/PhysRevLett.121.167601 apa: Zibrov, A., Rao, P., Kometter, C., Li, J., Dean, C., Taniguchi, T., … Young, A. (2018). Emergent dirac gullies and gully-symmetry-breaking quantum hall states in ABA trilayer graphene. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.121.167601 chicago: Zibrov, Alexander, Peng Rao, Carlos Kometter, Jia Li, Cory Dean, Takashi Taniguchi, Kenji Watanabe, Maksym Serbyn, and Andrea Young. “Emergent Dirac Gullies and Gully-Symmetry-Breaking Quantum Hall States in ABA Trilayer Graphene.” Physical Review Letters. American Physical Society, 2018. https://doi.org/10.1103/PhysRevLett.121.167601. ieee: A. Zibrov et al., “Emergent dirac gullies and gully-symmetry-breaking quantum hall states in ABA trilayer graphene,” Physical Review Letters, vol. 121, no. 16. American Physical Society, 2018. ista: Zibrov A, Rao P, Kometter C, Li J, Dean C, Taniguchi T, Watanabe K, Serbyn M, Young A. 2018. Emergent dirac gullies and gully-symmetry-breaking quantum hall states in ABA trilayer graphene. Physical Review Letters. 121(16), 167601. mla: Zibrov, Alexander, et al. “Emergent Dirac Gullies and Gully-Symmetry-Breaking Quantum Hall States in ABA Trilayer Graphene.” Physical Review Letters, vol. 121, no. 16, 167601, American Physical Society, 2018, doi:10.1103/PhysRevLett.121.167601. short: A. Zibrov, P. Rao, C. Kometter, J. Li, C. Dean, T. Taniguchi, K. Watanabe, M. Serbyn, A. Young, Physical Review Letters 121 (2018). date_created: 2018-12-11T11:45:38Z date_published: 2018-10-19T00:00:00Z date_updated: 2023-09-11T13:39:50Z day: '19' department: - _id: MaSe doi: 10.1103/PhysRevLett.121.167601 external_id: arxiv: - '1805.01038' isi: - '000447307500007' intvolume: ' 121' isi: 1 issue: '16' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1805.01038 month: '10' oa: 1 oa_version: Preprint publication: Physical Review Letters publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Emergent dirac gullies and gully-symmetry-breaking quantum hall states in ABA trilayer graphene type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 121 year: '2018' ... --- _id: '5767' abstract: - lang: eng text: 'Cuprate superconductors have long been thought of as having strong electronic correlations but negligible spin-orbit coupling. Using spin- and angle-resolved photoemission spectroscopy, we discovered that one of the most studied cuprate superconductors, Bi2212, has a nontrivial spin texture with a spin-momentum locking that circles the Brillouin zone center and a spin-layer locking that allows states of opposite spin to be localized in different parts of the unit cell. Our findings pose challenges for the vast majority of models of cuprates, such as the Hubbard model and its variants, where spin-orbit interaction has been mostly neglected, and open the intriguing question of how the high-temperature superconducting state emerges in the presence of this nontrivial spin texture. ' acknowledgement: ' M.S. was supported by the Gordon and Betty Moore Foundation s EPiQS Initiative through grant GBMF4307' article_processing_charge: No article_type: original author: - first_name: Kenneth full_name: Gotlieb, Kenneth last_name: Gotlieb - first_name: Chiu-Yun full_name: Lin, Chiu-Yun last_name: Lin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Wentao full_name: Zhang, Wentao last_name: Zhang - first_name: Christopher L. full_name: Smallwood, Christopher L. last_name: Smallwood - first_name: Christopher full_name: Jozwiak, Christopher last_name: Jozwiak - first_name: Hiroshi full_name: Eisaki, Hiroshi last_name: Eisaki - first_name: Zahid full_name: Hussain, Zahid last_name: Hussain - first_name: Ashvin full_name: Vishwanath, Ashvin last_name: Vishwanath - first_name: Alessandra full_name: Lanzara, Alessandra last_name: Lanzara citation: ama: Gotlieb K, Lin C-Y, Serbyn M, et al. Revealing hidden spin-momentum locking in a high-temperature cuprate superconductor. Science. 2018;362(6420):1271-1275. doi:10.1126/science.aao0980 apa: Gotlieb, K., Lin, C.-Y., Serbyn, M., Zhang, W., Smallwood, C. L., Jozwiak, C., … Lanzara, A. (2018). Revealing hidden spin-momentum locking in a high-temperature cuprate superconductor. Science. American Association for the Advancement of Science. https://doi.org/10.1126/science.aao0980 chicago: Gotlieb, Kenneth, Chiu-Yun Lin, Maksym Serbyn, Wentao Zhang, Christopher L. Smallwood, Christopher Jozwiak, Hiroshi Eisaki, Zahid Hussain, Ashvin Vishwanath, and Alessandra Lanzara. “Revealing Hidden Spin-Momentum Locking in a High-Temperature Cuprate Superconductor.” Science. American Association for the Advancement of Science, 2018. https://doi.org/10.1126/science.aao0980. ieee: K. Gotlieb et al., “Revealing hidden spin-momentum locking in a high-temperature cuprate superconductor,” Science, vol. 362, no. 6420. American Association for the Advancement of Science, pp. 1271–1275, 2018. ista: Gotlieb K, Lin C-Y, Serbyn M, Zhang W, Smallwood CL, Jozwiak C, Eisaki H, Hussain Z, Vishwanath A, Lanzara A. 2018. Revealing hidden spin-momentum locking in a high-temperature cuprate superconductor. Science. 362(6420), 1271–1275. mla: Gotlieb, Kenneth, et al. “Revealing Hidden Spin-Momentum Locking in a High-Temperature Cuprate Superconductor.” Science, vol. 362, no. 6420, American Association for the Advancement of Science, 2018, pp. 1271–75, doi:10.1126/science.aao0980. short: K. Gotlieb, C.-Y. Lin, M. Serbyn, W. Zhang, C.L. Smallwood, C. Jozwiak, H. Eisaki, Z. Hussain, A. Vishwanath, A. Lanzara, Science 362 (2018) 1271–1275. date_created: 2018-12-19T14:53:50Z date_published: 2018-12-14T00:00:00Z date_updated: 2023-09-18T08:11:56Z day: '14' department: - _id: MaSe doi: 10.1126/science.aao0980 external_id: isi: - '000452994400048' intvolume: ' 362' isi: 1 issue: '6420' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1126/science.aao0980 month: '12' oa: 1 oa_version: Published Version page: 1271-1275 publication: Science publication_identifier: eissn: - 1095-9203 issn: - 0036-8075 publication_status: published publisher: American Association for the Advancement of Science quality_controlled: '1' scopus_import: '1' status: public title: Revealing hidden spin-momentum locking in a high-temperature cuprate superconductor type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 362 year: '2018' ... --- _id: '296' abstract: - lang: eng text: The thermodynamic description of many-particle systems rests on the assumption of ergodicity, the ability of a system to explore all allowed configurations in the phase space. Recent studies on many-body localization have revealed the existence of systems that strongly violate ergodicity in the presence of quenched disorder. Here, we demonstrate that ergodicity can be weakly broken by a different mechanism, arising from the presence of special eigenstates in the many-body spectrum that are reminiscent of quantum scars in chaotic non-interacting systems. In the single-particle case, quantum scars correspond to wavefunctions that concentrate in the vicinity of unstable periodic classical trajectories. We show that many-body scars appear in the Fibonacci chain, a model with a constrained local Hilbert space that has recently been experimentally realized in a Rydberg-atom quantum simulator. The quantum scarred eigenstates are embedded throughout the otherwise thermalizing many-body spectrum but lead to direct experimental signatures, as we show for periodic recurrences that reproduce those observed in the experiment. Our results suggest that scarred many-body bands give rise to a new universality class of quantum dynamics, opening up opportunities for the creation of novel states with long-lived coherence in systems that are now experimentally realizable. acknowledgement: C.J.T., A.M. and Z.P. acknowledge support from EPSRC grants EP/P009409/1 and EP/M50807X/1, and Royal Society Research Grant RG160635. D.A. acknowledges support from the Swiss National Science Foundation. article_processing_charge: No article_type: original author: - first_name: Christopher full_name: Turner, Christopher last_name: Turner - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis orcid: 0000-0002-8443-1064 - first_name: Dmitry full_name: Abanin, Dmitry last_name: Abanin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Zlatko full_name: Papić, Zlatko last_name: Papić citation: ama: Turner C, Michailidis A, Abanin D, Serbyn M, Papić Z. Weak ergodicity breaking from quantum many-body scars. Nature Physics. 2018;14:745-749. doi:10.1038/s41567-018-0137-5 apa: Turner, C., Michailidis, A., Abanin, D., Serbyn, M., & Papić, Z. (2018). Weak ergodicity breaking from quantum many-body scars. Nature Physics. Nature Publishing Group. https://doi.org/10.1038/s41567-018-0137-5 chicago: Turner, Christopher, Alexios Michailidis, Dmitry Abanin, Maksym Serbyn, and Zlatko Papić. “Weak Ergodicity Breaking from Quantum Many-Body Scars.” Nature Physics. Nature Publishing Group, 2018. https://doi.org/10.1038/s41567-018-0137-5. ieee: C. Turner, A. Michailidis, D. Abanin, M. Serbyn, and Z. Papić, “Weak ergodicity breaking from quantum many-body scars,” Nature Physics, vol. 14. Nature Publishing Group, pp. 745–749, 2018. ista: Turner C, Michailidis A, Abanin D, Serbyn M, Papić Z. 2018. Weak ergodicity breaking from quantum many-body scars. Nature Physics. 14, 745–749. mla: Turner, Christopher, et al. “Weak Ergodicity Breaking from Quantum Many-Body Scars.” Nature Physics, vol. 14, Nature Publishing Group, 2018, pp. 745–49, doi:10.1038/s41567-018-0137-5. short: C. Turner, A. Michailidis, D. Abanin, M. Serbyn, Z. Papić, Nature Physics 14 (2018) 745–749. date_created: 2018-12-11T11:45:40Z date_published: 2018-05-14T00:00:00Z date_updated: 2023-09-19T10:37:55Z day: '14' department: - _id: MaSe doi: 10.1038/s41567-018-0137-5 external_id: isi: - '000438253600028' intvolume: ' 14' isi: 1 language: - iso: eng main_file_link: - open_access: '1' url: http://eprints.whiterose.ac.uk/130860/ month: '05' oa: 1 oa_version: Submitted Version page: 745 - 749 publication: Nature Physics publication_status: published publisher: Nature Publishing Group publist_id: '7585' quality_controlled: '1' scopus_import: '1' status: public title: Weak ergodicity breaking from quantum many-body scars type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 14 year: '2018' ... --- _id: '44' abstract: - lang: eng text: 'Recent realization of a kinetically constrained chain of Rydberg atoms by Bernien et al., [Nature (London) 551, 579 (2017)] resulted in the observation of unusual revivals in the many-body quantum dynamics. In our previous work [C. J. Turner et al., Nat. Phys. 14, 745 (2018)], such dynamics was attributed to the existence of “quantum scarred” eigenstates in the many-body spectrum of the experimentally realized model. Here, we present a detailed study of the eigenstate properties of the same model. We find that the majority of the eigenstates exhibit anomalous thermalization: the observable expectation values converge to their Gibbs ensemble values, but parametrically slower compared to the predictions of the eigenstate thermalization hypothesis (ETH). Amidst the thermalizing spectrum, we identify nonergodic eigenstates that strongly violate the ETH, whose number grows polynomially with system size. Previously, the same eigenstates were identified via large overlaps with certain product states, and were used to explain the revivals observed in experiment. Here, we find that these eigenstates, in addition to highly atypical expectation values of local observables, also exhibit subthermal entanglement entropy that scales logarithmically with the system size. Moreover, we identify an additional class of quantum scarred eigenstates, and discuss their manifestations in the dynamics starting from initial product states. We use forward scattering approximation to describe the structure and physical properties of quantum scarred eigenstates. Finally, we discuss the stability of quantum scars to various perturbations. We observe that quantum scars remain robust when the introduced perturbation is compatible with the forward scattering approximation. In contrast, the perturbations which most efficiently destroy quantum scars also lead to the restoration of “canonical” thermalization.' acknowledged_ssus: - _id: ScienComp article_number: '155134' article_processing_charge: No author: - first_name: C J full_name: Turner, C J last_name: Turner - first_name: Alexios full_name: Michailidis, Alexios id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis orcid: 0000-0002-8443-1064 - first_name: D A full_name: Abanin, D A last_name: Abanin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Z full_name: Papić, Z last_name: Papić citation: ama: 'Turner CJ, Michailidis A, Abanin DA, Serbyn M, Papić Z. Quantum scarred eigenstates in a Rydberg atom chain: Entanglement, breakdown of thermalization, and stability to perturbations. Physical Review B. 2018;98(15). doi:10.1103/PhysRevB.98.155134' apa: 'Turner, C. J., Michailidis, A., Abanin, D. A., Serbyn, M., & Papić, Z. (2018). Quantum scarred eigenstates in a Rydberg atom chain: Entanglement, breakdown of thermalization, and stability to perturbations. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.98.155134' chicago: 'Turner, C J, Alexios Michailidis, D A Abanin, Maksym Serbyn, and Z Papić. “Quantum Scarred Eigenstates in a Rydberg Atom Chain: Entanglement, Breakdown of Thermalization, and Stability to Perturbations.” Physical Review B. American Physical Society, 2018. https://doi.org/10.1103/PhysRevB.98.155134.' ieee: 'C. J. Turner, A. Michailidis, D. A. Abanin, M. Serbyn, and Z. Papić, “Quantum scarred eigenstates in a Rydberg atom chain: Entanglement, breakdown of thermalization, and stability to perturbations,” Physical Review B, vol. 98, no. 15. American Physical Society, 2018.' ista: 'Turner CJ, Michailidis A, Abanin DA, Serbyn M, Papić Z. 2018. Quantum scarred eigenstates in a Rydberg atom chain: Entanglement, breakdown of thermalization, and stability to perturbations. Physical Review B. 98(15), 155134.' mla: 'Turner, C. J., et al. “Quantum Scarred Eigenstates in a Rydberg Atom Chain: Entanglement, Breakdown of Thermalization, and Stability to Perturbations.” Physical Review B, vol. 98, no. 15, 155134, American Physical Society, 2018, doi:10.1103/PhysRevB.98.155134.' short: C.J. Turner, A. Michailidis, D.A. Abanin, M. Serbyn, Z. Papić, Physical Review B 98 (2018). date_created: 2018-12-11T11:44:19Z date_published: 2018-10-22T00:00:00Z date_updated: 2023-10-10T13:28:49Z day: '22' department: - _id: MaSe doi: 10.1103/PhysRevB.98.155134 external_id: arxiv: - '1806.10933' isi: - '000447919100001' intvolume: ' 98' isi: 1 issue: '15' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1806.10933 month: '10' oa: 1 oa_version: Preprint publication: Physical Review B publication_status: published publisher: American Physical Society publist_id: '8010' quality_controlled: '1' scopus_import: '1' status: public title: 'Quantum scarred eigenstates in a Rydberg atom chain: Entanglement, breakdown of thermalization, and stability to perturbations' type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 98 year: '2018' ... --- _id: '445' abstract: - lang: eng text: The Loschmidt echo, defined as the overlap between quantum wave function evolved with different Hamiltonians, quantifies the sensitivity of quantum dynamics to perturbations and is often used as a probe of quantum chaos. In this work we consider the behavior of the Loschmidt echo in the many-body localized phase, which is characterized by emergent local integrals of motion and provides a generic example of nonergodic dynamics. We demonstrate that the fluctuations of the Loschmidt echo decay as a power law in time in the many-body localized phase, in contrast to the exponential decay in few-body ergodic systems. We consider the spin-echo generalization of the Loschmidt echo and argue that the corresponding correlation function saturates to a finite value in localized systems. Slow, power-law decay of fluctuations of such spin-echo-type overlap is related to the operator spreading and is present only in the many-body localized phase, but not in a noninteracting Anderson insulator. While most of the previously considered probes of dephasing dynamics could be understood by approximating physical spin operators with local integrals of motion, the Loschmidt echo and its generalizations crucially depend on the full expansion of the physical operators via local integrals of motion operators, as well as operators which flip local integrals of motion. Hence these probes allow one to get insights into the relation between physical operators and local integrals of motion and access the operator spreading in the many-body localized phase. acknowledgement: |- This research was supported in part by the National Science Foundation under Grant No. NSF PHY11-25915. M.S. was supported by Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant No. GBMF4307. D.A. also acknowledges support by Swiss National Science Foundation. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Dimitry full_name: Abanin, Dimitry A last_name: Abanin citation: ama: Serbyn M, Abanin D. Loschmidt echo in many body localized phases. Physical Review B - Condensed Matter and Materials Physics. 2017;96(1). doi:10.1103/PhysRevB.96.014202 apa: Serbyn, M., & Abanin, D. (2017). Loschmidt echo in many body localized phases. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.96.014202 chicago: Serbyn, Maksym, and Dimitry Abanin. “Loschmidt Echo in Many Body Localized Phases.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2017. https://doi.org/10.1103/PhysRevB.96.014202. ieee: M. Serbyn and D. Abanin, “Loschmidt echo in many body localized phases,” Physical Review B - Condensed Matter and Materials Physics, vol. 96, no. 1. American Physical Society, 2017. ista: Serbyn M, Abanin D. 2017. Loschmidt echo in many body localized phases. Physical Review B - Condensed Matter and Materials Physics. 96(1). mla: Serbyn, Maksym, and Dimitry Abanin. “Loschmidt Echo in Many Body Localized Phases.” Physical Review B - Condensed Matter and Materials Physics, vol. 96, no. 1, American Physical Society, 2017, doi:10.1103/PhysRevB.96.014202. short: M. Serbyn, D. Abanin, Physical Review B - Condensed Matter and Materials Physics 96 (2017). date_created: 2018-12-11T11:46:31Z date_published: 2017-07-12T00:00:00Z date_updated: 2021-01-12T07:57:03Z day: '12' doi: 10.1103/PhysRevB.96.014202 extern: 1 intvolume: ' 96' issue: '1' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1701.07772 month: '07' oa: 1 publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '7378' quality_controlled: 0 status: public title: Loschmidt echo in many body localized phases type: journal_article volume: 96 year: '2017' ... --- _id: '724' abstract: - lang: eng text: We investigate the stationary and dynamical behavior of an Anderson localized chain coupled to a single central bound state. Although this coupling partially dilutes the Anderson localized peaks towards nearly resonant sites, the most weight of the original peaks remains unchanged. This leads to multifractal wave functions with a frozen spectrum of fractal dimensions, which is characteristic for localized phases in models with power-law hopping. Using a perturbative approach we identify two different dynamical regimes. At weak couplings to the central site, the transport of particles and information is logarithmic in time, a feature usually attributed to many-body localization. We connect such transport to the persistence of the Poisson statistics of level spacings in parts of the spectrum. In contrast, at stronger couplings the level repulsion is established in the entire spectrum, the problem can be mapped to the Fano resonance, and the transport is ballistic. acknowledgement: "We would like to thank Dmitry Abanin, Christophe De\r\nBeule, \ Joel Moore, Romain Vasseur, and Norman Yao for\r\nmany stimulating discussions. \ Financial support has been\r\nprovided by the Deutsche Forschungsgemeinschaft \ (DFG)\r\nvia Grant No. TR950/8-1, SFB 1170 “ToCoTronics” and the\r\nENB Graduate \ School on Topological Insulators. M.S. was\r\nsupported by Gordon and Betty Moore Foundation’s EPiQS\r\nInitiative through Grant No. GBMF4307. F.P. acknowledges\r\nsupport from the DFG Research Unit FOR 1807 through Grant\r\nNo. PO 1370/2-1." article_number: '104203' author: - first_name: Daniel full_name: Hetterich, Daniel last_name: Hetterich - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Fernando full_name: Domínguez, Fernando last_name: Domínguez - first_name: Frank full_name: Pollmann, Frank last_name: Pollmann - first_name: Björn full_name: Trauzettel, Björn last_name: Trauzettel citation: ama: Hetterich D, Serbyn M, Domínguez F, Pollmann F, Trauzettel B. Noninteracting central site model localization and logarithmic entanglement growth. Physical Review B. 2017;96(10). doi:10.1103/PhysRevB.96.104203 apa: Hetterich, D., Serbyn, M., Domínguez, F., Pollmann, F., & Trauzettel, B. (2017). Noninteracting central site model localization and logarithmic entanglement growth. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.96.104203 chicago: Hetterich, Daniel, Maksym Serbyn, Fernando Domínguez, Frank Pollmann, and Björn Trauzettel. “Noninteracting Central Site Model Localization and Logarithmic Entanglement Growth.” Physical Review B. American Physical Society, 2017. https://doi.org/10.1103/PhysRevB.96.104203. ieee: D. Hetterich, M. Serbyn, F. Domínguez, F. Pollmann, and B. Trauzettel, “Noninteracting central site model localization and logarithmic entanglement growth,” Physical Review B, vol. 96, no. 10. American Physical Society, 2017. ista: Hetterich D, Serbyn M, Domínguez F, Pollmann F, Trauzettel B. 2017. Noninteracting central site model localization and logarithmic entanglement growth. Physical Review B. 96(10), 104203. mla: Hetterich, Daniel, et al. “Noninteracting Central Site Model Localization and Logarithmic Entanglement Growth.” Physical Review B, vol. 96, no. 10, 104203, American Physical Society, 2017, doi:10.1103/PhysRevB.96.104203. short: D. Hetterich, M. Serbyn, F. Domínguez, F. Pollmann, B. Trauzettel, Physical Review B 96 (2017). date_created: 2018-12-11T11:48:09Z date_published: 2017-09-13T00:00:00Z date_updated: 2021-01-12T08:12:35Z day: '13' department: - _id: MaSe doi: 10.1103/PhysRevB.96.104203 intvolume: ' 96' issue: '10' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1701.02744 month: '09' oa: 1 oa_version: Submitted Version publication: Physical Review B publication_identifier: issn: - '24699950' publication_status: published publisher: American Physical Society publist_id: '6955' quality_controlled: '1' scopus_import: 1 status: public title: Noninteracting central site model localization and logarithmic entanglement growth type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 96 year: '2017' ... --- _id: '834' abstract: - lang: eng text: 'Thermal and many-body localized phases are separated by a dynamical phase transition of a new kind. We analyze the distribution of off-diagonal matrix elements of local operators across this transition in two different models of disordered spin chains. We show that the behavior of matrix elements can be used to characterize the breakdown of thermalization and to extract the many-body Thouless energy. We find that upon increasing the disorder strength the system enters a critical region around the many-body localization transition. The properties of the system in this region are: (i) the Thouless energy becomes smaller than the level spacing, (ii) the matrix elements show critical dependence on the energy difference, and (iii) the matrix elements, viewed as amplitudes of a fictitious wave function, exhibit strong multifractality. This critical region decreases with the system size, which we interpret as evidence for a diverging correlation length at the many-body localization transition. Our findings show that the correlation length becomes larger than the accessible system sizes in a broad range of disorder strength values and shed light on the critical behavior near the many-body localization transition.' acknowledgement: We acknowledge useful discussions with V. Kravtsov, T. Grover, and R. Vasseur. M.S. was supported by Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant GBMF4307. M.S. and D.A. acknowledge hospitality of KITP, where parts of this work were completed (supported in part by the National Science Foundation under Grant No. NSF PHY11-25915) article_number: '104201' article_processing_charge: No author: - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Papic full_name: Zlatko, Papic last_name: Zlatko - first_name: Dmitry full_name: Abanin, Dmitry last_name: Abanin citation: ama: Serbyn M, Zlatko P, Abanin D. Thouless energy and multifractality across the many-body localization transition. Physical Review B - Condensed Matter and Materials Physics. 2017;96(10). doi:10.1103/PhysRevB.96.104201 apa: Serbyn, M., Zlatko, P., & Abanin, D. (2017). Thouless energy and multifractality across the many-body localization transition. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.96.104201 chicago: Serbyn, Maksym, Papic Zlatko, and Dmitry Abanin. “Thouless Energy and Multifractality across the Many-Body Localization Transition.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2017. https://doi.org/10.1103/PhysRevB.96.104201. ieee: M. Serbyn, P. Zlatko, and D. Abanin, “Thouless energy and multifractality across the many-body localization transition,” Physical Review B - Condensed Matter and Materials Physics, vol. 96, no. 10. American Physical Society, 2017. ista: Serbyn M, Zlatko P, Abanin D. 2017. Thouless energy and multifractality across the many-body localization transition. Physical Review B - Condensed Matter and Materials Physics. 96(10), 104201. mla: Serbyn, Maksym, et al. “Thouless Energy and Multifractality across the Many-Body Localization Transition.” Physical Review B - Condensed Matter and Materials Physics, vol. 96, no. 10, 104201, American Physical Society, 2017, doi:10.1103/PhysRevB.96.104201. short: M. Serbyn, P. Zlatko, D. Abanin, Physical Review B - Condensed Matter and Materials Physics 96 (2017). date_created: 2018-12-11T11:48:45Z date_published: 2017-09-06T00:00:00Z date_updated: 2023-09-26T15:51:54Z day: '06' department: - _id: MaSe doi: 10.1103/PhysRevB.96.104201 external_id: isi: - '000409429300004' intvolume: ' 96' isi: 1 issue: '10' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1610.02389 month: '09' oa: 1 oa_version: Submitted Version publication: Physical Review B - Condensed Matter and Materials Physics publication_identifier: issn: - '24699950' publication_status: published publisher: American Physical Society publist_id: '6814' quality_controlled: '1' scopus_import: '1' status: public title: Thouless energy and multifractality across the many-body localization transition type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 96 year: '2017' ... --- _id: '983' abstract: - lang: eng text: The half-filled Landau level is expected to be approximately particle-hole symmetric, which requires an extension of the Halperin-Lee-Read (HLR) theory of the compressible state observed at this filling. Recent work indicates that, when particle-hole symmetry is preserved, the composite fermions experience a quantized π-Berry phase upon winding around the composite Fermi surface, analogous to Dirac fermions at the surface of a 3D topological insulator. In contrast, the effective low-energy theory of the composite fermion liquid originally proposed by HLR lacks particle-hole symmetry and has vanishing Berry phase. In this paper, we explain how thermoelectric transport measurements can be used to test the Dirac nature of the composite fermions by quantitatively extracting this Berry phase. First, we point out that longitudinal thermopower (Seebeck effect) is nonvanishing because of the unusual nature of particle-hole symmetry in this context and is not sensitive to the Berry phase. In contrast, we find that off-diagonal thermopower (Nernst effect) is directly related to the topological structure of the composite Fermi surface, vanishing for zero Berry phase and taking its maximal value for π Berry phase. In contrast, in purely electrical transport signatures, the Berry phase contributions appear as small corrections to a large background signal, making the Nernst effect a promising diagnostic of the Dirac nature of composite fermions. acknowledgement: We thank B. I. Halperin, N. Cooper, C. Wang, J. Alicea, and M. Zaletel for insightful conversations. A. C. P. and M. S. were supported by the Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant No. GBMF4307. A. V. was supported by a Simons Investigator grant. author: - first_name: Andrew full_name: Potter, Andrew C last_name: Potter - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Ashvin full_name: Vishwanath, Ashvin K last_name: Vishwanath citation: ama: Potter A, Serbyn M, Vishwanath A. Thermoelectric transport signatures of Dirac composite fermions in the half-filled Landau level. Physical Review X. 2016;6(3). doi:10.1103/PhysRevX.6.031026 apa: Potter, A., Serbyn, M., & Vishwanath, A. (2016). Thermoelectric transport signatures of Dirac composite fermions in the half-filled Landau level. Physical Review X. American Physical Society. https://doi.org/10.1103/PhysRevX.6.031026 chicago: Potter, Andrew, Maksym Serbyn, and Ashvin Vishwanath. “Thermoelectric Transport Signatures of Dirac Composite Fermions in the Half-Filled Landau Level.” Physical Review X. American Physical Society, 2016. https://doi.org/10.1103/PhysRevX.6.031026. ieee: A. Potter, M. Serbyn, and A. Vishwanath, “Thermoelectric transport signatures of Dirac composite fermions in the half-filled Landau level,” Physical Review X, vol. 6, no. 3. American Physical Society, 2016. ista: Potter A, Serbyn M, Vishwanath A. 2016. Thermoelectric transport signatures of Dirac composite fermions in the half-filled Landau level. Physical Review X. 6(3). mla: Potter, Andrew, et al. “Thermoelectric Transport Signatures of Dirac Composite Fermions in the Half-Filled Landau Level.” Physical Review X, vol. 6, no. 3, American Physical Society, 2016, doi:10.1103/PhysRevX.6.031026. short: A. Potter, M. Serbyn, A. Vishwanath, Physical Review X 6 (2016). date_created: 2018-12-11T11:49:32Z date_published: 2016-01-01T00:00:00Z date_updated: 2021-01-12T08:22:25Z day: '01' doi: 10.1103/PhysRevX.6.031026 extern: 1 intvolume: ' 6' issue: '3' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1512.06852 month: '01' oa: 1 publication: Physical Review X publication_status: published publisher: American Physical Society publist_id: '6417' quality_controlled: 0 status: public title: Thermoelectric transport signatures of Dirac composite fermions in the half-filled Landau level type: journal_article volume: 6 year: '2016' ... --- _id: '985' abstract: - lang: eng text: We report on magnetotransport studies of dual-gated, Bernal-stacked trilayer graphene (TLG) encapsulated in boron nitride crystals. We observe a quantum Hall effect staircase which indicates a complete lifting of the 12-fold degeneracy of the zeroth Landau level. As a function of perpendicular electric field, our data exhibit a sequence of phase transitions between all integer quantum Hall states in the filling factor interval -8<ν<0. We develop a theoretical model and argue that, in contrast to monolayer and bilayer graphene, the observed Landau level splittings and quantum Hall phase transitions can be understood within a single-particle picture, but imply the presence of a charge density imbalance between the inner and outer layers of TLG, even at charge neutrality and zero transverse electric field. Our results indicate the importance of a previously unaccounted band structure parameter which, together with a more accurate estimate of the other tight-binding parameters, results in a significantly improved determination of the electronic and Landau level structure of TLG. acknowledgement: This work has been primarily supported by the National Science Foundation (DMR-1405221) for device fabrication and transport, and partly by ONR Young Investigator Award N00014-13-1-0610 for data analysis. author: - first_name: Leonardo full_name: Campos, Leonardo C last_name: Campos - first_name: Thiti full_name: Taychatanapat, Thiti last_name: Taychatanapat - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Kawin full_name: Surakitbovorn, Kawin N last_name: Surakitbovorn - first_name: Kenji full_name: Watanabe, Kenji last_name: Watanabe - first_name: Takashi full_name: Taniguchi, Takashi last_name: Taniguchi - first_name: Dmitry full_name: Abanin, Dmitry A last_name: Abanin - first_name: Pablo full_name: Jarillo-Herrero, Pablo last_name: Jarillo Herrero citation: ama: Campos L, Taychatanapat T, Serbyn M, et al. Landau Level Splittings, Phase Transitions, and Nonuniform Charge Distribution in Trilayer Graphene. Physical Review Letters. 2016;117(6). doi:10.1103/PhysRevLett.117.066601 apa: Campos, L., Taychatanapat, T., Serbyn, M., Surakitbovorn, K., Watanabe, K., Taniguchi, T., … Jarillo Herrero, P. (2016). Landau Level Splittings, Phase Transitions, and Nonuniform Charge Distribution in Trilayer Graphene. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.117.066601 chicago: Campos, Leonardo, Thiti Taychatanapat, Maksym Serbyn, Kawin Surakitbovorn, Kenji Watanabe, Takashi Taniguchi, Dmitry Abanin, and Pablo Jarillo Herrero. “Landau Level Splittings, Phase Transitions, and Nonuniform Charge Distribution in Trilayer Graphene.” Physical Review Letters. American Physical Society, 2016. https://doi.org/10.1103/PhysRevLett.117.066601. ieee: L. Campos et al., “Landau Level Splittings, Phase Transitions, and Nonuniform Charge Distribution in Trilayer Graphene,” Physical Review Letters, vol. 117, no. 6. American Physical Society, 2016. ista: Campos L, Taychatanapat T, Serbyn M, Surakitbovorn K, Watanabe K, Taniguchi T, Abanin D, Jarillo Herrero P. 2016. Landau Level Splittings, Phase Transitions, and Nonuniform Charge Distribution in Trilayer Graphene. Physical Review Letters. 117(6). mla: Campos, Leonardo, et al. “Landau Level Splittings, Phase Transitions, and Nonuniform Charge Distribution in Trilayer Graphene.” Physical Review Letters, vol. 117, no. 6, American Physical Society, 2016, doi:10.1103/PhysRevLett.117.066601. short: L. Campos, T. Taychatanapat, M. Serbyn, K. Surakitbovorn, K. Watanabe, T. Taniguchi, D. Abanin, P. Jarillo Herrero, Physical Review Letters 117 (2016). date_created: 2018-12-11T11:49:33Z date_published: 2016-04-01T00:00:00Z date_updated: 2021-01-12T08:22:26Z day: '01' doi: 10.1103/PhysRevLett.117.066601 extern: 1 intvolume: ' 117' issue: '6' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1607.00784 month: '04' oa: 1 publication: Physical Review Letters publication_status: published publisher: American Physical Society publist_id: '6415' quality_controlled: 0 status: public title: Landau Level Splittings, Phase Transitions, and Nonuniform Charge Distribution in Trilayer Graphene type: journal_article volume: 117 year: '2016' ... --- _id: '984' abstract: - lang: eng text: The entanglement spectrum of the reduced density matrix contains information beyond the von Neumann entropy and provides unique insights into exotic orders or critical behavior of quantum systems. Here, we show that strongly disordered systems in the many-body localized phase have power-law entanglement spectra, arising from the presence of extensively many local integrals of motion. The power-law entanglement spectrum distinguishes many-body localized systems from ergodic systems, as well as from ground states of gapped integrable models or free systems in the vicinity of scale-invariant critical points. We confirm our results using large-scale exact diagonalization. In addition, we develop a matrix-product state algorithm which allows us to access the eigenstates of large systems close to the localization transition, and discuss general implications of our results for variational studies of highly excited eigenstates in many-body localized systems. acknowledgement: We thank M. Stoudenmire and C. Turner for useful discussions. M. S. was supported by Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF4307. This research was supported in part by the National Science Foundation under Grant No. NSF PHY11-25915, and by the Swiss National Science Foundation and Alfred Sloan Foundation (D. A.). This work made use of the facilities of N8 HPC Centre of Excellence, provided and funded by the N8 consortium and EPSRC (Grant No. EP/K000225/1). The Centre is coordinated by the Universities of Leeds and Manchester. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Alexios full_name: Alexios Michailidis id: 36EBAD38-F248-11E8-B48F-1D18A9856A87 last_name: Michailidis - first_name: Dmitry full_name: Abanin, Dmitry A last_name: Abanin - first_name: Zlatko full_name: Papić, Zlatko last_name: Papić citation: ama: Serbyn M, Michailidis A, Abanin D, Papić Z. Power-law entanglement spectrum in many-body localized phases. Physical Review Letters. 2016;117(16). doi:10.1103/PhysRevLett.117.160601 apa: Serbyn, M., Michailidis, A., Abanin, D., & Papić, Z. (2016). Power-law entanglement spectrum in many-body localized phases. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.117.160601 chicago: Serbyn, Maksym, Alexios Michailidis, Dmitry Abanin, and Zlatko Papić. “Power-Law Entanglement Spectrum in Many-Body Localized Phases.” Physical Review Letters. American Physical Society, 2016. https://doi.org/10.1103/PhysRevLett.117.160601. ieee: M. Serbyn, A. Michailidis, D. Abanin, and Z. Papić, “Power-law entanglement spectrum in many-body localized phases,” Physical Review Letters, vol. 117, no. 16. American Physical Society, 2016. ista: Serbyn M, Michailidis A, Abanin D, Papić Z. 2016. Power-law entanglement spectrum in many-body localized phases. Physical Review Letters. 117(16). mla: Serbyn, Maksym, et al. “Power-Law Entanglement Spectrum in Many-Body Localized Phases.” Physical Review Letters, vol. 117, no. 16, American Physical Society, 2016, doi:10.1103/PhysRevLett.117.160601. short: M. Serbyn, A. Michailidis, D. Abanin, Z. Papić, Physical Review Letters 117 (2016). date_created: 2018-12-11T11:49:32Z date_published: 2016-10-16T00:00:00Z date_updated: 2021-01-12T08:22:25Z day: '16' doi: 10.1103/PhysRevLett.117.160601 extern: 1 intvolume: ' 117' issue: '16' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1605.05737 month: '10' oa: 1 publication: Physical Review Letters publication_status: published publisher: American Physical Society publist_id: '6414' quality_controlled: 0 status: public title: Power-law entanglement spectrum in many-body localized phases type: journal_article volume: 117 year: '2016' ... --- _id: '986' abstract: - lang: eng text: The many-body localization transition (MBLT) between ergodic and many-body localized phases in disordered interacting systems is a subject of much recent interest. The statistics of eigenenergies is known to be a powerful probe of crossovers between ergodic and integrable systems in simpler examples of quantum chaos. We consider the evolution of the spectral statistics across the MBLT, starting with mapping to a Brownian motion process that analytically relates the spectral properties to the statistics of matrix elements. We demonstrate that the flow from Wigner-Dyson to Poisson statistics is a two-stage process. First, a fractal enhancement of matrix elements upon approaching the MBLT from the delocalized side produces an effective power-law interaction between energy levels, and leads to a plasma model for level statistics. At the second stage, the gas of eigenvalues has local interactions and the level statistics belongs to a semi-Poisson universality class. We verify our findings numerically on the XXZ spin chain. We provide a microscopic understanding of the level statistics across the MBLT and discuss implications for the transition that are strong constraints on possible theories. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Joel full_name: Moore, Joel E last_name: Moore citation: ama: Serbyn M, Moore J. Spectral statistics across the many-body localization transition. Physical Review B - Condensed Matter and Materials Physics. 2016;93(4). doi:10.1103/PhysRevB.93.041424 apa: Serbyn, M., & Moore, J. (2016). Spectral statistics across the many-body localization transition. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.93.041424 chicago: Serbyn, Maksym, and Joel Moore. “Spectral Statistics across the Many-Body Localization Transition.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2016. https://doi.org/10.1103/PhysRevB.93.041424. ieee: M. Serbyn and J. Moore, “Spectral statistics across the many-body localization transition,” Physical Review B - Condensed Matter and Materials Physics, vol. 93, no. 4. American Physical Society, 2016. ista: Serbyn M, Moore J. 2016. Spectral statistics across the many-body localization transition. Physical Review B - Condensed Matter and Materials Physics. 93(4). mla: Serbyn, Maksym, and Joel Moore. “Spectral Statistics across the Many-Body Localization Transition.” Physical Review B - Condensed Matter and Materials Physics, vol. 93, no. 4, American Physical Society, 2016, doi:10.1103/PhysRevB.93.041424. short: M. Serbyn, J. Moore, Physical Review B - Condensed Matter and Materials Physics 93 (2016). date_created: 2018-12-11T11:49:33Z date_published: 2016-01-29T00:00:00Z date_updated: 2021-01-12T08:22:26Z day: '29' doi: 10.1103/PhysRevB.93.041424 extern: 1 intvolume: ' 93' issue: '4' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1508.07293 month: '01' oa: 1 publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '6416' quality_controlled: 0 status: public title: Spectral statistics across the many-body localization transition type: journal_article volume: 93 year: '2016' ... --- _id: '987' abstract: - lang: eng text: In contrast to bulk FeSe, which exhibits nematic order and low temperature superconductivity, highly doped FeSe reverses the situation, having high temperature superconductivity appearing alongside a suppression of nematic order. To investigate this phenomenon, we study a minimal electronic model of FeSe, with interactions that enhance nematic fluctuations. This model is sign problem free, and is simulated using determinant quantum Monte Carlo (DQMC). We developed a DQMC algorithm with parallel tempering, which proves to be an efficient source of global updates and allows us to access the region of strong interactions. Over a wide range of intermediate couplings, we observe superconductivity with an extended s-wave order parameter, along with enhanced, but short-ranged, q=(0,0) ferro-orbital (nematic) order. These results are consistent with approximate weak-coupling treatments that predict that nematic fluctuations lead to superconducting pairing. Surprisingly, in the parameter range under study, we do not observe nematic long-range order. Instead, at stronger coupling an unusual insulating phase with q=(π,π) antiferro-orbital order appears, which is missed by weak-coupling approximations. acknowledgement: We thank S. Gazit for numerous discussions. This research was supported by the Gordon and Betty Moore Foundation EPiQS Initiative through Grant No. GBMF4307 (M.S.), the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Grant No. DE-SC0014671 (R.T.S.), and a Simons Investigator grant (A.V.). author: - first_name: Philipp full_name: Dumitrescu, Philipp T last_name: Dumitrescu - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Richard full_name: Scalettar, Richard T last_name: Scalettar - first_name: Ashvin full_name: Vishwanath, Ashvin K last_name: Vishwanath citation: ama: 'Dumitrescu P, Serbyn M, Scalettar R, Vishwanath A. Superconductivity and nematic fluctuations in a model of doped FeSe monolayers: Determinant quantum Monte Carlo study. Physical Review B - Condensed Matter and Materials Physics. 2016;94(15). doi:10.1103/PhysRevB.94.155127' apa: 'Dumitrescu, P., Serbyn, M., Scalettar, R., & Vishwanath, A. (2016). Superconductivity and nematic fluctuations in a model of doped FeSe monolayers: Determinant quantum Monte Carlo study. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.94.155127' chicago: 'Dumitrescu, Philipp, Maksym Serbyn, Richard Scalettar, and Ashvin Vishwanath. “Superconductivity and Nematic Fluctuations in a Model of Doped FeSe Monolayers: Determinant Quantum Monte Carlo Study.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2016. https://doi.org/10.1103/PhysRevB.94.155127.' ieee: 'P. Dumitrescu, M. Serbyn, R. Scalettar, and A. Vishwanath, “Superconductivity and nematic fluctuations in a model of doped FeSe monolayers: Determinant quantum Monte Carlo study,” Physical Review B - Condensed Matter and Materials Physics, vol. 94, no. 15. American Physical Society, 2016.' ista: 'Dumitrescu P, Serbyn M, Scalettar R, Vishwanath A. 2016. Superconductivity and nematic fluctuations in a model of doped FeSe monolayers: Determinant quantum Monte Carlo study. Physical Review B - Condensed Matter and Materials Physics. 94(15).' mla: 'Dumitrescu, Philipp, et al. “Superconductivity and Nematic Fluctuations in a Model of Doped FeSe Monolayers: Determinant Quantum Monte Carlo Study.” Physical Review B - Condensed Matter and Materials Physics, vol. 94, no. 15, American Physical Society, 2016, doi:10.1103/PhysRevB.94.155127.' short: P. Dumitrescu, M. Serbyn, R. Scalettar, A. Vishwanath, Physical Review B - Condensed Matter and Materials Physics 94 (2016). date_created: 2018-12-11T11:49:33Z date_published: 2016-10-17T00:00:00Z date_updated: 2021-01-12T08:22:27Z day: '17' doi: 10.1103/PhysRevB.94.155127 extern: 1 intvolume: ' 94' issue: '15' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1512.08523 month: '10' oa: 1 publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '6413' quality_controlled: 0 status: public title: 'Superconductivity and nematic fluctuations in a model of doped FeSe monolayers: Determinant quantum Monte Carlo study' type: journal_article volume: 94 year: '2016' ... --- _id: '981' abstract: - lang: eng text: The tunability of topological surface states and controllable opening of the Dirac gap are of fundamental and practical interest in the field of topological materials. In the newly discovered topological crystalline insulators (TCIs), theory predicts that the Dirac node is protected by a crystalline symmetry and that the surface state electrons can acquire a mass if this symmetry is broken. Recent studies have detected signatures of a spontaneously generated Dirac gap in TCIs; however, the mechanism of mass formation remains elusive. In this work, we present scanning tunnelling microscopy (STM) measurements of the TCI Pb 1â'x Sn x Se for a wide range of alloy compositions spanning the topological and non-topological regimes. The STM topographies reveal a symmetry-breaking distortion on the surface, which imparts mass to the otherwise massless Dirac electrons-a mechanism analogous to the long sought-after Higgs mechanism in particle physics. Interestingly, the measured Dirac gap decreases on approaching the trivial phase, whereas the magnitude of the distortion remains nearly constant. Our data and calculations reveal that the penetration depth of Dirac surface states controls the magnitude of the Dirac mass. At the limit of the critical composition, the penetration depth is predicted to go to infinity, resulting in zero mass, consistent with our measurements. Finally, we discover the existence of surface states in the non-topological regime, which have the characteristics of gapped, double-branched Dirac fermions and could be exploited in realizing superconductivity in these materials. acknowledgement: We thank R. Buczko, C. Chamon, J. C. Seamus Davis, M. El-Batanouny, A. Mesaros, Y. Ran and A. Soumyanarayanan for useful conversations and G. McMahon for help with EDS measurements. V.M. gratefully acknowledges funding from the US Department of Energy, Scanned Probe Division under Award Number DE-FG02-12ER46880 for the support of I.Z., Y.O., W.Z. and D.W. for this project. Work at Massachusetts Institute of Technology is supported by US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award DE-SC0010526 (L.F.), and NSF-DMR-1104498 (M.S.). H.L. acknowledges the Singapore National Research Foundation for support under NRF Award No. NRF-NRFF2013-03. Y.O. was partly supported by JSPS KAKENHI Grant Numbers 26707016 and 00707656. The work at Northeastern University is supported by the US Department of Energy grant number DE-FG02-07ER46352, and benefited from Northeastern University’s Advanced Scientific Computation Center (ASCC), theory support at the Advanced Light Source, Berkeley and the allocation of supercomputer time at the NERSC through DOE grant number DE-AC02-05CH11231. Work at Princeton University is supported by the US National Science Foundation Grant, NSF-DMR-1006492. F.C. acknowledges the support provided by MOST-Taiwan under project number NSC-102-2119-M-002-004. author: - first_name: Ilija full_name: Zeljkovic, Ilija last_name: Zeljkovic - first_name: Yoshinori full_name: Okada, Yoshinori last_name: Okada - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Raman full_name: Sankar, Raman last_name: Sankar - first_name: Daniel full_name: Walkup, Daniel last_name: Walkup - first_name: Wenwen full_name: Zhou, Wenwen last_name: Zhou - first_name: Junwei full_name: Liu, Junwei last_name: Liu - first_name: Guoqing full_name: Chang, Guoqing last_name: Chang - first_name: Yungjui full_name: Wang, Yungjui last_name: Wang - first_name: Md full_name: Hasan, Md Z last_name: Hasan - first_name: Fangcheng full_name: Chou, Fangcheng last_name: Chou - first_name: Hsin full_name: Lin, Hsin last_name: Lin - first_name: Arun full_name: Bansil, Arun last_name: Bansil - first_name: Liang full_name: Fu, Liang last_name: Fu - first_name: Vidya full_name: Madhavan, Vidya last_name: Madhavan citation: ama: Zeljkovic I, Okada Y, Serbyn M, et al. Dirac mass generation from crystal symmetry breaking on the surfaces of topological crystalline insulators. Nature Materials. 2015;14(3):318-324. doi:10.1038/nmat4215 apa: Zeljkovic, I., Okada, Y., Serbyn, M., Sankar, R., Walkup, D., Zhou, W., … Madhavan, V. (2015). Dirac mass generation from crystal symmetry breaking on the surfaces of topological crystalline insulators. Nature Materials. Nature Publishing Group. https://doi.org/10.1038/nmat4215 chicago: Zeljkovic, Ilija, Yoshinori Okada, Maksym Serbyn, Raman Sankar, Daniel Walkup, Wenwen Zhou, Junwei Liu, et al. “Dirac Mass Generation from Crystal Symmetry Breaking on the Surfaces of Topological Crystalline Insulators.” Nature Materials. Nature Publishing Group, 2015. https://doi.org/10.1038/nmat4215. ieee: I. Zeljkovic et al., “Dirac mass generation from crystal symmetry breaking on the surfaces of topological crystalline insulators,” Nature Materials, vol. 14, no. 3. Nature Publishing Group, pp. 318–324, 2015. ista: Zeljkovic I, Okada Y, Serbyn M, Sankar R, Walkup D, Zhou W, Liu J, Chang G, Wang Y, Hasan M, Chou F, Lin H, Bansil A, Fu L, Madhavan V. 2015. Dirac mass generation from crystal symmetry breaking on the surfaces of topological crystalline insulators. Nature Materials. 14(3), 318–324. mla: Zeljkovic, Ilija, et al. “Dirac Mass Generation from Crystal Symmetry Breaking on the Surfaces of Topological Crystalline Insulators.” Nature Materials, vol. 14, no. 3, Nature Publishing Group, 2015, pp. 318–24, doi:10.1038/nmat4215. short: I. Zeljkovic, Y. Okada, M. Serbyn, R. Sankar, D. Walkup, W. Zhou, J. Liu, G. Chang, Y. Wang, M. Hasan, F. Chou, H. Lin, A. Bansil, L. Fu, V. Madhavan, Nature Materials 14 (2015) 318–324. date_created: 2018-12-11T11:49:31Z date_published: 2015-03-01T00:00:00Z date_updated: 2021-01-12T08:22:24Z day: '01' doi: 10.1038/nmat4215 extern: 1 intvolume: ' 14' issue: '3' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1403.4906 month: '03' oa: 1 page: 318 - 324 publication: Nature Materials publication_status: published publisher: Nature Publishing Group publist_id: '6419' quality_controlled: 0 status: public title: Dirac mass generation from crystal symmetry breaking on the surfaces of topological crystalline insulators type: journal_article volume: 14 year: '2015' ... --- _id: '982' abstract: - lang: eng text: We propose a new approach to probing ergodicity and its breakdown in one-dimensional quantum manybody systems based on their response to a local perturbation. We study the distribution of matrix elements of a local operator between the system's eigenstates, finding a qualitatively different behavior in the manybody localized (MBL) and ergodic phases. To characterize how strongly a local perturbation modifies the eigenstates, we introduce the parameter g(L) = (In (Vnm/δ)) which represents the disorder-averaged ratio of a typical matrix element of a local operator V to energy level spacing δ this parameter is reminiscent of the Thouless conductance in the single-particle localization. We show that the parameter g(L) decreases with system size L in the MBL phase and grows in the ergodic phase. We surmise that the delocalization transition occurs when g(L) is independent of system size, g(L)=gc ~ 1. We illustrate our approach by studying the many-body localization transition and resolving the many-body mobility edge in a disordered one-dimensional XXZ spin-1=2 chain using exact diagonalization and time-evolving block-decimation methods. Our criterion for the MBL transition gives insights into microscopic details of transition. Its direct physical consequences, in particular, logarithmically slow transport at the transition and extensive entanglement entropy of the eigenstates, are consistent with recent renormalization-group predictions. acknowledgement: We acknowledge helpful discussions with Sid Parameswaran, Andrew Potter, Antonello Scardicchio, Romain Vasseur, and especially with Ehud Altman and David Huse. We would like to thank Miles Stoudenmire for the assistance with ITensor library. Research at Perimeter Institute is supported by the Government of Canada through Industry Canada and by the Province of Ontario through the Ministry of Economic Development & Innovation. This research was supported by Gordon and Betty Moore Foundation EPiQS Initiative through Grant No. GBMF4307 (M. S.), Sloan Foundation, NSERC, and Early Researcher Award of Ontario (D. A.). This work made use of the facilities of N8 HPC Centre of Excellence, provided and funded by the N8 consortium and EPSRC (Grant No. EP/K000225/1). The Centre is coordinated by the Universities of Leeds and Manchester. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Zlatko full_name: Papić, Zlatko last_name: Papić - first_name: Dmitry full_name: Abanin, Dmitry A last_name: Abanin citation: ama: Serbyn M, Papić Z, Abanin D. Criterion for many-body localization-delocalization phase transition. Physical Review X. 2015;5(4). doi:10.1103/PhysRevX.5.041047 apa: Serbyn, M., Papić, Z., & Abanin, D. (2015). Criterion for many-body localization-delocalization phase transition. Physical Review X. American Physical Society. https://doi.org/10.1103/PhysRevX.5.041047 chicago: Serbyn, Maksym, Zlatko Papić, and Dmitry Abanin. “Criterion for Many-Body Localization-Delocalization Phase Transition.” Physical Review X. American Physical Society, 2015. https://doi.org/10.1103/PhysRevX.5.041047. ieee: M. Serbyn, Z. Papić, and D. Abanin, “Criterion for many-body localization-delocalization phase transition,” Physical Review X, vol. 5, no. 4. American Physical Society, 2015. ista: Serbyn M, Papić Z, Abanin D. 2015. Criterion for many-body localization-delocalization phase transition. Physical Review X. 5(4). mla: Serbyn, Maksym, et al. “Criterion for Many-Body Localization-Delocalization Phase Transition.” Physical Review X, vol. 5, no. 4, American Physical Society, 2015, doi:10.1103/PhysRevX.5.041047. short: M. Serbyn, Z. Papić, D. Abanin, Physical Review X 5 (2015). date_created: 2018-12-11T11:49:32Z date_published: 2015-01-01T00:00:00Z date_updated: 2021-01-12T08:22:25Z day: '01' doi: 10.1103/PhysRevX.5.041047 extern: 1 intvolume: ' 5' issue: '4' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1507.01635 month: '01' oa: 1 publication: Physical Review X publication_status: published publisher: American Physical Society publist_id: '6418' quality_controlled: 0 status: public title: Criterion for many-body localization-delocalization phase transition type: journal_article volume: 5 year: '2015' ... --- _id: '977' abstract: - lang: eng text: We propose a method for detecting many-body localization (MBL) in disordered spin systems. The method involves pulsed coherent spin manipulations that probe the dephasing of a given spin due to its entanglement with a set of distant spins. It allows one to distinguish the MBL phase from a noninteracting localized phase and a delocalized phase. In particular, we show that for a properly chosen pulse sequence the MBL phase exhibits a characteristic power-law decay reflecting its slow growth of entanglement. We find that this power-law decay is robust with respect to thermal and disorder averaging, provide numerical simulations supporting our results, and discuss possible experimental realizations in solid-state and cold-atom systems. acknowledgement: |- We thank E. Altman, Y. Bahri, I. Bloch, T. Giamarchi, D. Huse, V. Oganesyan, A. Pal, D. Pekker, and G. Refael for insightful discussions. The authors acknowledge support from the Harvard Quantum Optics Center, Harvard-MIT CUA, the DARPA OLE program, AFOSR Quantum Simulation MURI, ARO-MURI on Atomtronics, the ARO-MURI Quism program, the Austrian Science Fund (FWF) Project No. J 3361-N20, NSERC grant, and Sloan Research Fellowship. Simulations presented in this article were performed on computational resources supported by the High Performance Computing Center (PICSciE) at Princeton University and the Research Computing Center at Harvard University. Research at Perimeter Institute was supported by the Government of Canada and by the Province of Ontario. M. S., M. K., and S. G. contributed equally to this work. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Michael full_name: Knap, Michael J last_name: Knap - first_name: Sarang full_name: Gopalakrishnan, Sarang last_name: Gopalakrishnan - first_name: Zlatko full_name: Papić, Zlatko last_name: Papić - first_name: Norman full_name: Yao, Norman Y last_name: Yao - first_name: Chris full_name: Laumann, Chris R last_name: Laumann - first_name: Dmitry full_name: Abanin, Dmitry A last_name: Abanin - first_name: Mikhail full_name: Lukin, Mikhail D last_name: Lukin - first_name: Eugene full_name: Demler, Eugene A last_name: Demler citation: ama: Serbyn M, Knap M, Gopalakrishnan S, et al. Interferometric probes of many-body localization. Physical Review Letters. 2014;113(14). doi:10.1103/PhysRevLett.113.147204 apa: Serbyn, M., Knap, M., Gopalakrishnan, S., Papić, Z., Yao, N., Laumann, C., … Demler, E. (2014). Interferometric probes of many-body localization. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.113.147204 chicago: Serbyn, Maksym, Michael Knap, Sarang Gopalakrishnan, Zlatko Papić, Norman Yao, Chris Laumann, Dmitry Abanin, Mikhail Lukin, and Eugene Demler. “Interferometric Probes of Many-Body Localization.” Physical Review Letters. American Physical Society, 2014. https://doi.org/10.1103/PhysRevLett.113.147204. ieee: M. Serbyn et al., “Interferometric probes of many-body localization,” Physical Review Letters, vol. 113, no. 14. American Physical Society, 2014. ista: Serbyn M, Knap M, Gopalakrishnan S, Papić Z, Yao N, Laumann C, Abanin D, Lukin M, Demler E. 2014. Interferometric probes of many-body localization. Physical Review Letters. 113(14). mla: Serbyn, Maksym, et al. “Interferometric Probes of Many-Body Localization.” Physical Review Letters, vol. 113, no. 14, American Physical Society, 2014, doi:10.1103/PhysRevLett.113.147204. short: M. Serbyn, M. Knap, S. Gopalakrishnan, Z. Papić, N. Yao, C. Laumann, D. Abanin, M. Lukin, E. Demler, Physical Review Letters 113 (2014). date_created: 2018-12-11T11:49:30Z date_published: 2014-10-03T00:00:00Z date_updated: 2021-01-12T08:22:22Z day: '03' doi: 10.1103/PhysRevLett.113.147204 extern: 1 intvolume: ' 113' issue: '14' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1403.0693 month: '10' oa: 1 publication: Physical Review Letters publication_status: published publisher: American Physical Society publist_id: '6421' quality_controlled: 0 status: public title: Interferometric probes of many-body localization type: journal_article volume: 113 year: '2014' ... --- _id: '980' abstract: - lang: eng text: Many-body localized (MBL) systems are characterized by the absence of transport and thermalization and, therefore, cannot be described by conventional statistical mechanics. In this paper, using analytic arguments and numerical simulations, we study the behavior of local observables in an isolated MBL system following a quantum quench. For the case of a global quench, we find that the local observables reach stationary, highly nonthermal values at long times as a result of slow dephasing characteristic of the MBL phase. These stationary values retain the local memory of the initial state due to the existence of local integrals of motion in the MBL phase. The temporal fluctuations around stationary values exhibit universal power-law decay in time, with an exponent set by the localization length and the diagonal entropy of the initial state. Such a power-law decay holds for any local observable and is related to the logarithmic in time growth of entanglement in the MBL phase. This behavior distinguishes the MBL phase from both the Anderson insulator (where no stationary state is reached) and from the ergodic phase (where relaxation is expected to be exponential). For the case of a local quench, we also find a power-law approach of local observables to their stationary values when the system is prepared in a mixed state. Quench protocols considered in this paper can be naturally implemented in systems of ultracold atoms in disordered optical lattices, and the behavior of local observables provides a direct experimental signature of many-body localization. acknowledgement: Research at Perimeter Institute is supported by the Government of Canada through Industry Canada and by the Province of Ontario through the Ministry of Economic Development & Innovation. We acknowledge support by NSERC Discovery Grant (D.A.). author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Zlatko full_name: Papić, Zlatko last_name: Papić - first_name: Dmitry full_name: Abanin, Dmitry A last_name: Abanin citation: ama: Serbyn M, Papić Z, Abanin D. Quantum quenches in the many-body localized phase. Physical Review B - Condensed Matter and Materials Physics. 2014;90(17). doi:10.1103/PhysRevB.90.174302 apa: Serbyn, M., Papić, Z., & Abanin, D. (2014). Quantum quenches in the many-body localized phase. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.90.174302 chicago: Serbyn, Maksym, Zlatko Papić, and Dmitry Abanin. “Quantum Quenches in the Many-Body Localized Phase.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2014. https://doi.org/10.1103/PhysRevB.90.174302. ieee: M. Serbyn, Z. Papić, and D. Abanin, “Quantum quenches in the many-body localized phase,” Physical Review B - Condensed Matter and Materials Physics, vol. 90, no. 17. American Physical Society, 2014. ista: Serbyn M, Papić Z, Abanin D. 2014. Quantum quenches in the many-body localized phase. Physical Review B - Condensed Matter and Materials Physics. 90(17). mla: Serbyn, Maksym, et al. “Quantum Quenches in the Many-Body Localized Phase.” Physical Review B - Condensed Matter and Materials Physics, vol. 90, no. 17, American Physical Society, 2014, doi:10.1103/PhysRevB.90.174302. short: M. Serbyn, Z. Papić, D. Abanin, Physical Review B - Condensed Matter and Materials Physics 90 (2014). date_created: 2018-12-11T11:49:31Z date_published: 2014-11-06T00:00:00Z date_updated: 2021-01-12T08:22:24Z day: '06' doi: 10.1103/PhysRevB.90.174302 extern: 1 intvolume: ' 90' issue: '17' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1408.4105 month: '11' oa: 1 publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '6420' quality_controlled: 0 status: public title: Quantum quenches in the many-body localized phase type: journal_article volume: 90 year: '2014' ... --- _id: '978' abstract: - lang: eng text: The newly discovered topological crystalline insulators feature a complex band structure involving multiple Dirac cones, and are potentially highly tunable by external electric field, temperature or strain. Theoretically, it has been predicted that the various Dirac cones, which are offset in energy and momentum, might harbour vastly different orbital character. However, their orbital texture, which is of immense importance in determining a variety of a materialâ €™ s properties remains elusive. Here, we unveil the orbital texture of Pb 1â ̂'x Sn x Se, a prototypical topological crystalline insulator. By using Fourier-transform scanning tunnelling spectroscopy we measure the interference patterns produced by the scattering of surface-state electrons. We discover that the intensity and energy dependences of the Fourier transforms show distinct characteristics, which can be directly attributed to orbital effects. Our experiments reveal a complex band topology involving two Lifshitz transitions and establish the orbital nature of the Dirac bands, which could provide an alternative pathway towards future quantum applications. acknowledgement: V.M. gratefully acknowledges funding from the US Department of Energy, Scanned Probe Division under Award Number DE-FG02-12ER46880 for the primary support of I.Z. and Y.O. (experiments, data analysis and writing the paper) and NSF-ECCS-1232105 for the partial support of W.Z. and D.W. (data acquisition). Work at Massachusetts Institute of Technology is supported by US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award DE-SC0010526 (L.F.), and NSF DMR 1104498 (M.S.). H.L. acknowledges the Singapore National Research Foundation for support under NRF Award No. NRF-NRFF2013-03. The work at Northeastern University is supported by the US Department of Energy grant number DE-FG02-07ER46352, and benefited from Northeastern University’s Advanced Scientific Computation Center (ASCC), theory support at the Advanced Light Source, Berkeley and the allocation of time at the NERSC supercomputing centre through DOE grant number DE-AC02-05CH11231. W-F.T. and C-Y.H. were supported by the NSC in Taiwan under Grant No. 102-2112-M-110-009. W-F.T. also thanks C. Fang for useful discussions. Work at Princeton University is supported by the US National Science Foundation Grant, NSF-DMR-1006492. F.C. acknowledges the support provided by MOST-Taiwan under project number NSC-102-2119-M-002-004. author: - first_name: Ilija full_name: Zeljkovic, Ilija last_name: Zeljkovic - first_name: Yoshinori full_name: Okada, Yoshinori last_name: Okada - first_name: Chengyi full_name: Huang, Chengyi last_name: Huang - first_name: Raman full_name: Sankar, Raman last_name: Sankar - first_name: Daniel full_name: Walkup, Daniel last_name: Walkup - first_name: Wenwen full_name: Zhou, Wenwen last_name: Zhou - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Fangcheng full_name: Chou, Fangcheng last_name: Chou - first_name: Wei full_name: Tsai, Wei-Feng last_name: Tsai - first_name: Hsin full_name: Lin, Hsin last_name: Lin - first_name: Arun full_name: Bansil, Arun last_name: Bansil - first_name: Liang full_name: Fu, Liang last_name: Fu - first_name: Md full_name: Hasan, Md Z last_name: Hasan - first_name: Vidya full_name: Madhavan, Vidya last_name: Madhavan citation: ama: Zeljkovic I, Okada Y, Huang C, et al. Mapping the unconventional orbital texture in topological crystalline insulators. Nature Physics. 2014;10(8):572-577. doi:10.1038/nphys3012 apa: Zeljkovic, I., Okada, Y., Huang, C., Sankar, R., Walkup, D., Zhou, W., … Madhavan, V. (2014). Mapping the unconventional orbital texture in topological crystalline insulators. Nature Physics. Nature Publishing Group. https://doi.org/10.1038/nphys3012 chicago: Zeljkovic, Ilija, Yoshinori Okada, Chengyi Huang, Raman Sankar, Daniel Walkup, Wenwen Zhou, Maksym Serbyn, et al. “Mapping the Unconventional Orbital Texture in Topological Crystalline Insulators.” Nature Physics. Nature Publishing Group, 2014. https://doi.org/10.1038/nphys3012. ieee: I. Zeljkovic et al., “Mapping the unconventional orbital texture in topological crystalline insulators,” Nature Physics, vol. 10, no. 8. Nature Publishing Group, pp. 572–577, 2014. ista: Zeljkovic I, Okada Y, Huang C, Sankar R, Walkup D, Zhou W, Serbyn M, Chou F, Tsai W, Lin H, Bansil A, Fu L, Hasan M, Madhavan V. 2014. Mapping the unconventional orbital texture in topological crystalline insulators. Nature Physics. 10(8), 572–577. mla: Zeljkovic, Ilija, et al. “Mapping the Unconventional Orbital Texture in Topological Crystalline Insulators.” Nature Physics, vol. 10, no. 8, Nature Publishing Group, 2014, pp. 572–77, doi:10.1038/nphys3012. short: I. Zeljkovic, Y. Okada, C. Huang, R. Sankar, D. Walkup, W. Zhou, M. Serbyn, F. Chou, W. Tsai, H. Lin, A. Bansil, L. Fu, M. Hasan, V. Madhavan, Nature Physics 10 (2014) 572–577. date_created: 2018-12-11T11:49:30Z date_published: 2014-08-01T00:00:00Z date_updated: 2021-01-12T08:22:23Z day: '01' doi: 10.1038/nphys3012 extern: 1 intvolume: ' 10' issue: '8' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1312.0164 month: '08' oa: 1 page: 572 - 577 publication: Nature Physics publication_status: published publisher: Nature Publishing Group publist_id: '6423' quality_controlled: 0 status: public title: Mapping the unconventional orbital texture in topological crystalline insulators type: journal_article volume: 10 year: '2014' ... --- _id: '979' abstract: - lang: eng text: In the recently discovered topological crystalline insulators SnTe and Pb1-xSnx(Te, Se), crystal symmetry and electronic topology intertwine to create topological surface states with many interesting features including Lifshitz transition, Van-Hove singularity, and fermion mass generation. These surface states are protected by mirror symmetry with respect to the (110) plane. In this work we present a comprehensive study of the effects of different mirror-symmetry-breaking perturbations on the (001) surface band structure. Pristine (001) surface states have four branches of Dirac fermions at low energy. We show that ferroelectric-type structural distortion generates a mass and gaps out some or all of these Dirac points, while strain shifts Dirac points in the Brillouin zone. An in-plane magnetic field leaves the surface state gapless, but introduces asymmetry between Dirac points. Finally, an out-of-plane magnetic field leads to discrete Landau levels. We show that the Landau level spectrum has an unusual pattern of degeneracy and interesting features due to the unique underlying band structure. This suggests that Landau level spectroscopy can detect and distinguish between different mechanisms of symmetry breaking in topological crystalline insulators. acknowledgement: We thank V. Madhavan and Y. Okada for related collaborations, and P. A. Lee for discussions. M.S. was supported by P. A. Lee via Grant No. NSF DMR 1104498. L.F. is supported by the DOE Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under award DE-SC0010526. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Liang full_name: Fu, Liang last_name: Fu citation: ama: Serbyn M, Fu L. Symmetry breaking and Landau quantization in topological crystalline insulators. Physical Review B - Condensed Matter and Materials Physics. 2014;90(3). doi:10.1103/PhysRevB.90.035402 apa: Serbyn, M., & Fu, L. (2014). Symmetry breaking and Landau quantization in topological crystalline insulators. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.90.035402 chicago: Serbyn, Maksym, and Liang Fu. “Symmetry Breaking and Landau Quantization in Topological Crystalline Insulators.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2014. https://doi.org/10.1103/PhysRevB.90.035402. ieee: M. Serbyn and L. Fu, “Symmetry breaking and Landau quantization in topological crystalline insulators,” Physical Review B - Condensed Matter and Materials Physics, vol. 90, no. 3. American Physical Society, 2014. ista: Serbyn M, Fu L. 2014. Symmetry breaking and Landau quantization in topological crystalline insulators. Physical Review B - Condensed Matter and Materials Physics. 90(3). mla: Serbyn, Maksym, and Liang Fu. “Symmetry Breaking and Landau Quantization in Topological Crystalline Insulators.” Physical Review B - Condensed Matter and Materials Physics, vol. 90, no. 3, American Physical Society, 2014, doi:10.1103/PhysRevB.90.035402. short: M. Serbyn, L. Fu, Physical Review B - Condensed Matter and Materials Physics 90 (2014). date_created: 2018-12-11T11:49:31Z date_published: 2014-07-03T00:00:00Z date_updated: 2021-01-12T08:22:23Z day: '03' doi: 10.1103/PhysRevB.90.035402 extern: 1 intvolume: ' 90' issue: '3' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1403.8153 month: '07' oa: 1 publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '6422' quality_controlled: 0 status: public title: Symmetry breaking and Landau quantization in topological crystalline insulators type: journal_article volume: 90 year: '2014' ... --- _id: '971' abstract: - lang: eng text: We study the stability of the normal state in a mesoscopic NSN junction biased by a constant voltage V with respect to the formation of the superconducting order. Using the linearized time-dependent Ginzburg-Landau equation, we obtain the temperature dependence of the instability line, V inst(T), where nucleation of superconductivity takes place. For sufficiently low biases, a stationary symmetric superconducting state emerges below the instability line. For higher biases, the normal phase is destroyed by the formation of a nonstationary bimodal state with two superconducting nuclei localized near the opposite terminals. The low-temperature and large-voltage behavior of the instability line is highly sensitive to the details of the inelastic relaxation mechanism in the wire. Therefore, experimental studies of Vinst(T) in NSN junctions may be used as an effective tool to access the parameters of the inelastic relaxation in the normal state. acknowledgement: We are grateful to M. V. Feigel'man, A. Kamenev, T. M. Klapwijk, J. P. Pekola, V. V. Ryazanov, J. C. W. Song, and D. Y. Vodolazov for discussions. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Mikhail full_name: Skvortsov, Mikhail A last_name: Skvortsov citation: ama: Serbyn M, Skvortsov M. Onset of superconductivity in a voltage-biased normal-superconducting-normal microbridge. Physical Review B - Condensed Matter and Materials Physics. 2013;87(2). doi:10.1103/PhysRevB.87.020501 apa: Serbyn, M., & Skvortsov, M. (2013). Onset of superconductivity in a voltage-biased normal-superconducting-normal microbridge. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.87.020501 chicago: Serbyn, Maksym, and Mikhail Skvortsov. “Onset of Superconductivity in a Voltage-Biased Normal-Superconducting-Normal Microbridge.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2013. https://doi.org/10.1103/PhysRevB.87.020501. ieee: M. Serbyn and M. Skvortsov, “Onset of superconductivity in a voltage-biased normal-superconducting-normal microbridge,” Physical Review B - Condensed Matter and Materials Physics, vol. 87, no. 2. American Physical Society, 2013. ista: Serbyn M, Skvortsov M. 2013. Onset of superconductivity in a voltage-biased normal-superconducting-normal microbridge. Physical Review B - Condensed Matter and Materials Physics. 87(2). mla: Serbyn, Maksym, and Mikhail Skvortsov. “Onset of Superconductivity in a Voltage-Biased Normal-Superconducting-Normal Microbridge.” Physical Review B - Condensed Matter and Materials Physics, vol. 87, no. 2, American Physical Society, 2013, doi:10.1103/PhysRevB.87.020501. short: M. Serbyn, M. Skvortsov, Physical Review B - Condensed Matter and Materials Physics 87 (2013). date_created: 2018-12-11T11:49:28Z date_published: 2013-01-02T00:00:00Z date_updated: 2021-01-12T08:22:20Z day: '02' doi: 10.1103/PhysRevB.87.020501 extern: 1 intvolume: ' 87' issue: '2' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1208.6004 month: '01' oa: 1 publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '6429' quality_controlled: 0 status: public title: Onset of superconductivity in a voltage-biased normal-superconducting-normal microbridge type: journal_article volume: 87 year: '2013' ... --- _id: '972' abstract: - lang: eng text: In topological crystalline insulators (TCIs), topology and crystal symmetry intertwine to create surface states with distinct characteristics. The breaking of crystal symmetry in TCIs is predicted to impart mass to the massless Dirac fermions. Here, we report high-resolution scanning tunneling microscopy studies of a TCI, Pb1-xSnxSe that reveal the coexistence of zero-mass Dirac fermions protected by crystal symmetry with massive Dirac fermions consistent with crystal symmetry breaking. In addition, we show two distinct regimes of the Fermi surface topology separated by a Van-Hove singularity at the Lifshitz transition point. Our work paves the way for engineering the Dirac band gap and realizing interaction-driven topological quantum phenomena in TCIs. author: - first_name: Yoshinori full_name: Okada, Yoshinori last_name: Okada - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Hsin full_name: Lin, Hsin last_name: Lin - first_name: Daniel full_name: Walkup, Daniel last_name: Walkup - first_name: Wenwen full_name: Zhou, Wenwen last_name: Zhou - first_name: Chetan full_name: Dhital, Chetan last_name: Dhital - first_name: Madhab full_name: Neupane, Madhab last_name: Neupane - first_name: Suyang full_name: Xu, Suyang last_name: Xu - first_name: Yungjui full_name: Wang, Yungjui last_name: Wang - first_name: Raman full_name: Sankar, Raman last_name: Sankar - first_name: Fangcheng full_name: Chou, Fangcheng last_name: Chou - first_name: Arun full_name: Bansil, Arun last_name: Bansil - first_name: Md full_name: Hasan, Md last_name: Hasan - first_name: Stephen full_name: Wilson, Stephen last_name: Wilson - first_name: Liang full_name: Fu, Liang last_name: Fu - first_name: Vidya full_name: Madhavan, Vidya last_name: Madhavan citation: ama: Okada Y, Serbyn M, Lin H, et al. Observation of dirac node formation and mass acquisition in a topological crystalline insulator. Science. 2013;341(6153):1496-1499. doi:10.1126/science.1239451 apa: Okada, Y., Serbyn, M., Lin, H., Walkup, D., Zhou, W., Dhital, C., … Madhavan, V. (2013). Observation of dirac node formation and mass acquisition in a topological crystalline insulator. Science. American Association for the Advancement of Science. https://doi.org/10.1126/science.1239451 chicago: Okada, Yoshinori, Maksym Serbyn, Hsin Lin, Daniel Walkup, Wenwen Zhou, Chetan Dhital, Madhab Neupane, et al. “Observation of Dirac Node Formation and Mass Acquisition in a Topological Crystalline Insulator.” Science. American Association for the Advancement of Science, 2013. https://doi.org/10.1126/science.1239451. ieee: Y. Okada et al., “Observation of dirac node formation and mass acquisition in a topological crystalline insulator,” Science, vol. 341, no. 6153. American Association for the Advancement of Science, pp. 1496–1499, 2013. ista: Okada Y, Serbyn M, Lin H, Walkup D, Zhou W, Dhital C, Neupane M, Xu S, Wang Y, Sankar R, Chou F, Bansil A, Hasan M, Wilson S, Fu L, Madhavan V. 2013. Observation of dirac node formation and mass acquisition in a topological crystalline insulator. Science. 341(6153), 1496–1499. mla: Okada, Yoshinori, et al. “Observation of Dirac Node Formation and Mass Acquisition in a Topological Crystalline Insulator.” Science, vol. 341, no. 6153, American Association for the Advancement of Science, 2013, pp. 1496–99, doi:10.1126/science.1239451. short: Y. Okada, M. Serbyn, H. Lin, D. Walkup, W. Zhou, C. Dhital, M. Neupane, S. Xu, Y. Wang, R. Sankar, F. Chou, A. Bansil, M. Hasan, S. Wilson, L. Fu, V. Madhavan, Science 341 (2013) 1496–1499. date_created: 2018-12-11T11:49:29Z date_published: 2013-01-01T00:00:00Z date_updated: 2021-01-12T08:22:20Z day: '01' doi: 10.1126/science.1239451 extern: '1' external_id: arxiv: - '1305.2823' intvolume: ' 341' issue: '6153' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1305.2823 month: '01' oa: 1 oa_version: Preprint page: 1496 - 1499 publication: Science publication_status: published publisher: American Association for the Advancement of Science publist_id: '6430' quality_controlled: '1' status: public title: Observation of dirac node formation and mass acquisition in a topological crystalline insulator type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 341 year: '2013' ... --- _id: '975' abstract: - lang: eng text: Recent numerical work by Bardarson, Pollmann, and Moore revealed a slow, logarithmic in time, growth of the entanglement entropy for initial product states in a putative many-body localized phase. We show that this surprising phenomenon results from the dephasing due to exponentially small interaction-induced corrections to the eigenenergies of different states. For weak interactions, we find that the entanglement entropy grows as ξln (Vt/), where V is the interaction strength, and ξ is the single-particle localization length. The saturated value of the entanglement entropy at long times is determined by the participation ratios of the initial state over the eigenstates of the subsystem. Our work shows that the logarithmic entanglement growth is a universal phenomenon characteristic of the many-body localized phase in any number of spatial dimensions, and reveals a broad hierarchy of dephasing time scales present in such a phase. acknowledgement: We would like to thank E. Altman and J. Moore for useful comments on the manuscript. This research was supported in part by Perimeter Institute for Theoretical Physics. Research at Perimeter Institute is supported by the Government of Canada through Industry Canada and by the Province of Ontario through the Ministry of Economic Development & Innovation. Z. P. was supported by DOE Grant No. DE-SC0002140. The simulations presented in this article were performed on computational resources supported by the High Performance Computing Center (PICSciE) at Princeton University. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Zlatko full_name: Papić, Zlatko last_name: Papić - first_name: Dmitry full_name: Abanin, Dmitry A last_name: Abanin citation: ama: Serbyn M, Papić Z, Abanin D. Universal slow growth of entanglement in interacting strongly disordered systems. Physical Review Letters. 2013;110(26). doi:10.1103/PhysRevLett.110.260601 apa: Serbyn, M., Papić, Z., & Abanin, D. (2013). Universal slow growth of entanglement in interacting strongly disordered systems. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.110.260601 chicago: Serbyn, Maksym, Zlatko Papić, and Dmitry Abanin. “Universal Slow Growth of Entanglement in Interacting Strongly Disordered Systems.” Physical Review Letters. American Physical Society, 2013. https://doi.org/10.1103/PhysRevLett.110.260601. ieee: M. Serbyn, Z. Papić, and D. Abanin, “Universal slow growth of entanglement in interacting strongly disordered systems,” Physical Review Letters, vol. 110, no. 26. American Physical Society, 2013. ista: Serbyn M, Papić Z, Abanin D. 2013. Universal slow growth of entanglement in interacting strongly disordered systems. Physical Review Letters. 110(26). mla: Serbyn, Maksym, et al. “Universal Slow Growth of Entanglement in Interacting Strongly Disordered Systems.” Physical Review Letters, vol. 110, no. 26, American Physical Society, 2013, doi:10.1103/PhysRevLett.110.260601. short: M. Serbyn, Z. Papić, D. Abanin, Physical Review Letters 110 (2013). date_created: 2018-12-11T11:49:29Z date_published: 2013-06-28T00:00:00Z date_updated: 2021-01-12T08:22:22Z day: '28' doi: 10.1103/PhysRevLett.110.260601 extern: 1 intvolume: ' 110' issue: '26' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1304.4605 month: '06' oa: 1 publication: Physical Review Letters publication_status: published publisher: American Physical Society publist_id: '6426' quality_controlled: 0 status: public title: Universal slow growth of entanglement in interacting strongly disordered systems type: journal_article volume: 110 year: '2013' ... --- _id: '970' abstract: - lang: eng text: 'Recently a new high-mobility Dirac material, trilayer graphene, was realized experimentally. The band structure of ABA-stacked trilayer graphene consists of a monolayer-like and a bilayer-like pair of bands. Here we study electronic properties of ABA-stacked trilayer graphene biased by a perpendicular electric field. We find that the combination of the bias and trigonal warping gives rise to a set of new Dirac points: In each valley, seven species of Dirac fermions with small masses of order of a few meV emerge. The positions and masses of the emergent Dirac fermions are tunable by bias, and one group of Dirac fermions becomes massless at a certain bias value. Therefore, in contrast to bilayer graphene, the conductivity at the neutrality point is expected to show nonmonotonic behavior, becoming of the order of a few e2/h when some Dirac masses vanish. Further, we analyze the evolution of the Landau level spectrum as a function of bias. The emergence of new Dirac points in the band structure translates into new threefold-degenerate groups of Landau levels. This leads to an anomalous quantum Hall effect, in which some quantum Hall steps have a height of 3e2/h. At an intermediate bias, the degeneracies of all Landau levels get lifted, and in this regime all quantum Hall plateaus are spaced by e2/h. Finally, we show that the pattern of Landau level crossings is very sensitive to certain band structure parameters, and can therefore provide a useful tool for determining their precise values.' acknowledgement: We thank Pablo Jarillo-Herrero, Leonardo Campos, and Thiti Taychatanapat for attracting our attention to the problem of biased trilayer graphene, and for many helpful discussions. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Dmitry full_name: Abanin, Dmitry A last_name: Abanin citation: ama: Serbyn M, Abanin D. New Dirac points and multiple Landau level crossings in biased trilayer graphene. Physical Review B - Condensed Matter and Materials Physics. 2013;87(11). doi:10.1103/PhysRevB.87.115422 apa: Serbyn, M., & Abanin, D. (2013). New Dirac points and multiple Landau level crossings in biased trilayer graphene. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.87.115422 chicago: Serbyn, Maksym, and Dmitry Abanin. “New Dirac Points and Multiple Landau Level Crossings in Biased Trilayer Graphene.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2013. https://doi.org/10.1103/PhysRevB.87.115422. ieee: M. Serbyn and D. Abanin, “New Dirac points and multiple Landau level crossings in biased trilayer graphene,” Physical Review B - Condensed Matter and Materials Physics, vol. 87, no. 11. American Physical Society, 2013. ista: Serbyn M, Abanin D. 2013. New Dirac points and multiple Landau level crossings in biased trilayer graphene. Physical Review B - Condensed Matter and Materials Physics. 87(11). mla: Serbyn, Maksym, and Dmitry Abanin. “New Dirac Points and Multiple Landau Level Crossings in Biased Trilayer Graphene.” Physical Review B - Condensed Matter and Materials Physics, vol. 87, no. 11, American Physical Society, 2013, doi:10.1103/PhysRevB.87.115422. short: M. Serbyn, D. Abanin, Physical Review B - Condensed Matter and Materials Physics 87 (2013). date_created: 2018-12-11T11:49:28Z date_published: 2013-03-18T00:00:00Z date_updated: 2021-01-12T08:22:20Z day: '18' doi: 10.1103/PhysRevB.87.115422 extern: 1 intvolume: ' 87' issue: '11' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1212.6251 month: '03' oa: 1 publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '6428' quality_controlled: 0 status: public title: New Dirac points and multiple Landau level crossings in biased trilayer graphene type: journal_article volume: 87 year: '2013' ... --- _id: '973' abstract: - lang: eng text: We construct a complete set of local integrals of motion that characterize the many-body localized (MBL) phase. Our approach relies on the assumption that local perturbations act locally on the eigenstates in the MBL phase, which is supported by numerical simulations of the random-field XXZ spin chain. We describe the structure of the eigenstates in the MBL phase and discuss the implications of local conservation laws for its nonequilibrium quantum dynamics. We argue that the many-body localization can be used to protect coherence in the system by suppressing relaxation between eigenstates with different local integrals of motion. acknowledgement: We thank J. Moore for useful discussions. Research at Perimeter Institute is supported by the Government of Canada through Industry Canada and by the Province of Ontario through the Ministry of Economic Development & Innovation. Z. P. was supported by DOE Grant No. DE-SC0002140. M. S. was supported by the National Science Foundation under Grant No. DMR-1104498. The simulations presented in this article were performed on computational resources supported by the High Performance Computing Center (PICSciE) at Princeton University. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Zlatko full_name: Papić, Zlatko last_name: Papić - first_name: Dmitry full_name: Abanin, Dmitry A last_name: Abanin citation: ama: Serbyn M, Papić Z, Abanin D. Local conservation laws and the structure of the many body localized states. Physical Review Letters. 2013;111(12). doi:10.1103/PhysRevLett.111.127201 apa: Serbyn, M., Papić, Z., & Abanin, D. (2013). Local conservation laws and the structure of the many body localized states. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.111.127201 chicago: Serbyn, Maksym, Zlatko Papić, and Dmitry Abanin. “Local Conservation Laws and the Structure of the Many Body Localized States.” Physical Review Letters. American Physical Society, 2013. https://doi.org/10.1103/PhysRevLett.111.127201. ieee: M. Serbyn, Z. Papić, and D. Abanin, “Local conservation laws and the structure of the many body localized states,” Physical Review Letters, vol. 111, no. 12. American Physical Society, 2013. ista: Serbyn M, Papić Z, Abanin D. 2013. Local conservation laws and the structure of the many body localized states. Physical Review Letters. 111(12). mla: Serbyn, Maksym, et al. “Local Conservation Laws and the Structure of the Many Body Localized States.” Physical Review Letters, vol. 111, no. 12, American Physical Society, 2013, doi:10.1103/PhysRevLett.111.127201. short: M. Serbyn, Z. Papić, D. Abanin, Physical Review Letters 111 (2013). date_created: 2018-12-11T11:49:29Z date_published: 2013-09-17T00:00:00Z date_updated: 2021-01-12T08:22:21Z day: '17' doi: 10.1103/PhysRevLett.111.127201 extern: 1 intvolume: ' 111' issue: '12' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1305.5554 month: '09' oa: 1 publication: Physical Review Letters publication_status: published publisher: American Physical Society publist_id: '6424' quality_controlled: 0 status: public title: Local conservation laws and the structure of the many body localized states type: journal_article volume: 111 year: '2013' ... --- _id: '974' abstract: - lang: eng text: We propose a possible realization of the overscreened Kondo impurity problem by a magnetic s=1/2 impurity embedded in a two-dimensional S=1 U(1) spin liquid with a Fermi surface. This problem contains an interesting interplay between non-Fermi-liquid behavior induced by a U(1) gauge field coupled to fermions and a non-Fermi-liquid fixed point in the overscreened Kondo problem. Using a large-N expansion together with an expansion in the dynamical exponent of the gauge field, we find that the coupling to the gauge field leads to weak but observable changes in the physical properties of the system at the overscreened Kondo fixed point. We discuss the extrapolation of this result to a physical case and argue that the realization of overscreened Kondo physics could lead to observations of effects due to gauge fields. author: - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Todadri full_name: Senthil, Todadri last_name: Senthil - first_name: Patrick full_name: Lee, Patrick last_name: Lee citation: ama: Serbyn M, Senthil T, Lee P. Overscreened Kondo fixed point in S=1 spin liquid. Physical Review B - Condensed Matter and Materials Physics. 2013;88(2). doi:10.1103/PhysRevB.88.024419 apa: Serbyn, M., Senthil, T., & Lee, P. (2013). Overscreened Kondo fixed point in S=1 spin liquid. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.88.024419 chicago: Serbyn, Maksym, Todadri Senthil, and Patrick Lee. “Overscreened Kondo Fixed Point in S=1 Spin Liquid.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2013. https://doi.org/10.1103/PhysRevB.88.024419. ieee: M. Serbyn, T. Senthil, and P. Lee, “Overscreened Kondo fixed point in S=1 spin liquid,” Physical Review B - Condensed Matter and Materials Physics, vol. 88, no. 2. American Physical Society, 2013. ista: Serbyn M, Senthil T, Lee P. 2013. Overscreened Kondo fixed point in S=1 spin liquid. Physical Review B - Condensed Matter and Materials Physics. 88(2). mla: Serbyn, Maksym, et al. “Overscreened Kondo Fixed Point in S=1 Spin Liquid.” Physical Review B - Condensed Matter and Materials Physics, vol. 88, no. 2, American Physical Society, 2013, doi:10.1103/PhysRevB.88.024419. short: M. Serbyn, T. Senthil, P. Lee, Physical Review B - Condensed Matter and Materials Physics 88 (2013). date_created: 2018-12-11T11:49:29Z date_published: 2013-07-19T00:00:00Z date_updated: 2021-01-12T08:22:21Z day: '19' doi: 10.1103/PhysRevB.88.024419 extern: '1' external_id: arxiv: - '1212.5179' intvolume: ' 88' issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1212.5179 month: '07' oa: 1 oa_version: Preprint publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '6425' quality_controlled: '1' status: public title: Overscreened Kondo fixed point in S=1 spin liquid type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 88 year: '2013' ... --- _id: '976' abstract: - lang: eng text: 'Motivated by a search for experimental probes to access the physics of fractionalized excitations called spinons in spin liquids, we study the interaction of spinons with lattice vibrations. We consider the case of algebraic spin liquid, when spinons have fermionic statistics and a Dirac-like dispersion. We establish the general procedure for deriving spinon-phonon interactions, which is based on symmetry considerations. The procedure is illustrated for four different algebraic spin liquids: π-flux and staggered-flux phases on a square lattice, π-flux phase on a kagome lattice, and zero-flux phase on a honeycomb lattice. Although the low-energy description is similar for all these phases, different underlying symmetry groups lead to a distinct form of spinon-phonon interaction Hamiltonian. The explicit form of the spinon-phonon interaction is used to estimate the attenuation of ultrasound in an algebraic spin liquid. The prospects of the sound attenuation as a probe of spinons are discussed.' acknowledgement: M. S. is grateful to X.-G. Wen, L. Levitov, M. Metlitski, K. Michaeli, K.-T. Chen, and A. Potter for many useful discussions. We acknowledge support by Grant No. NSF DMR 1104498. We acknowledge the hospitality of KITP, where final stages of this project were completed. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Patrick full_name: Lee, Patrick last_name: Lee citation: ama: Serbyn M, Lee P. Spinon-phonon interaction in algebraic spin liquids. Physical Review B - Condensed Matter and Materials Physics. 2013;87(17). doi:10.1103/PhysRevB.87.174424 apa: Serbyn, M., & Lee, P. (2013). Spinon-phonon interaction in algebraic spin liquids. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.87.174424 chicago: Serbyn, Maksym, and Patrick Lee. “Spinon-Phonon Interaction in Algebraic Spin Liquids.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2013. https://doi.org/10.1103/PhysRevB.87.174424. ieee: M. Serbyn and P. Lee, “Spinon-phonon interaction in algebraic spin liquids,” Physical Review B - Condensed Matter and Materials Physics, vol. 87, no. 17. American Physical Society, 2013. ista: Serbyn M, Lee P. 2013. Spinon-phonon interaction in algebraic spin liquids. Physical Review B - Condensed Matter and Materials Physics. 87(17). mla: Serbyn, Maksym, and Patrick Lee. “Spinon-Phonon Interaction in Algebraic Spin Liquids.” Physical Review B - Condensed Matter and Materials Physics, vol. 87, no. 17, American Physical Society, 2013, doi:10.1103/PhysRevB.87.174424. short: M. Serbyn, P. Lee, Physical Review B - Condensed Matter and Materials Physics 87 (2013). date_created: 2018-12-11T11:49:30Z date_published: 2013-05-22T00:00:00Z date_updated: 2021-01-12T08:22:22Z day: '22' doi: 10.1103/PhysRevB.87.174424 extern: 1 intvolume: ' 87' issue: '17' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1303.0772 month: '05' oa: 1 publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '6427' quality_controlled: 0 status: public title: Spinon-phonon interaction in algebraic spin liquids type: journal_article volume: 87 year: '2013' ... --- _id: '966' abstract: - lang: eng text: Motivated by recent experiments on Ba3NiSb2O 9, we investigate possible quantum spin liquid ground states for spin S=1 Heisenberg models on the triangular lattice. We use variational Monte Carlo techniques to calculate the energies of microscopic spin liquid wave functions where spin is represented by three flavors of fermionic spinon operators. These energies are compared with the energies of various competing three-sublattice ordered states. Our approach shows that the antiferromagnetic Heisenberg model with biquadratic term and single-ion anisotropy does not have a low-temperature spin liquid phase. However, for an SU(3)-invariant model with sufficiently strong ring-exchange terms, we find a paired chiral quantum spin liquid with a Fermi surface of deconfined spinons that is stable against all types of ordering patterns we considered. We discuss the physics of this exotic spin liquid state in relation to the recent experiment and suggest new ways to test this scenario. acknowledgement: We thank Kuang-Ting Chen, Rebecca Flint, Dmitri Ivanov, Z.-X. Liu, Tai-Kai Ng, Lara Thompson, Tamás Tóth, and Fa Wang for helpful discussions. T.S. is supported by NSF DMR 1005434. P.A.L. is supported by NSF DMR 1104498. S.B. acknowledges support from the Swiss National Science Foundation (SNSF). author: - first_name: Samuel full_name: Bieri, Samuel last_name: Bieri - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Todadri full_name: Senthil, Todadri S last_name: Senthil - first_name: Patrick full_name: Lee, Patrick last_name: Lee citation: ama: Bieri S, Serbyn M, Senthil T, Lee P. Paired chiral spin liquid with a Fermi surface in S=1 model on the triangular lattice. Physical Review B - Condensed Matter and Materials Physics. 2012;86(22). doi:10.1103/PhysRevB.86.224409 apa: Bieri, S., Serbyn, M., Senthil, T., & Lee, P. (2012). Paired chiral spin liquid with a Fermi surface in S=1 model on the triangular lattice. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.86.224409 chicago: Bieri, Samuel, Maksym Serbyn, Todadri Senthil, and Patrick Lee. “Paired Chiral Spin Liquid with a Fermi Surface in S=1 Model on the Triangular Lattice.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2012. https://doi.org/10.1103/PhysRevB.86.224409. ieee: S. Bieri, M. Serbyn, T. Senthil, and P. Lee, “Paired chiral spin liquid with a Fermi surface in S=1 model on the triangular lattice,” Physical Review B - Condensed Matter and Materials Physics, vol. 86, no. 22. American Physical Society, 2012. ista: Bieri S, Serbyn M, Senthil T, Lee P. 2012. Paired chiral spin liquid with a Fermi surface in S=1 model on the triangular lattice. Physical Review B - Condensed Matter and Materials Physics. 86(22). mla: Bieri, Samuel, et al. “Paired Chiral Spin Liquid with a Fermi Surface in S=1 Model on the Triangular Lattice.” Physical Review B - Condensed Matter and Materials Physics, vol. 86, no. 22, American Physical Society, 2012, doi:10.1103/PhysRevB.86.224409. short: S. Bieri, M. Serbyn, T. Senthil, P. Lee, Physical Review B - Condensed Matter and Materials Physics 86 (2012). date_created: 2018-12-11T11:49:27Z date_published: 2012-12-13T00:00:00Z date_updated: 2021-01-12T08:22:18Z day: '13' doi: 10.1103/PhysRevB.86.224409 extern: 1 intvolume: ' 86' issue: '22' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1208.3231 month: '12' oa: 1 publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '6431' quality_controlled: 0 status: public title: Paired chiral spin liquid with a Fermi surface in S=1 model on the triangular lattice type: journal_article volume: 86 year: '2012' ... --- _id: '967' abstract: - lang: eng text: Motivated by recent experiments on the material Ba3NiSb 2O9, we consider a spin-one quantum antiferromagnet on a triangular lattice with the Heisenberg bilinear and biquadratic exchange interactions and a single-ion anisotropy. Using a fermionic "triplon" representation for spins, we study the phase diagram within mean-field theory. In addition to a fully gapped spin-liquid ground state, we find a state where one gapless triplon mode with a Fermi surface coexists with d+id topological pairing of the other triplons. Despite the existence of a Fermi surface, this ground state has fully gapped bulk spin excitations. Such a state has linear in-temperature specific heat and constant in-plane spin susceptibility, with an unusually high Wilson ratio. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Todadri full_name: Senthil, Todadri S last_name: Senthil - first_name: Patrick full_name: Lee, Patrick last_name: Lee citation: ama: Serbyn M, Senthil T, Lee P. Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice. Physical Review B - Condensed Matter and Materials Physics. 2011;84(18). doi:10.1103/PhysRevB.84.180403 apa: Serbyn, M., Senthil, T., & Lee, P. (2011). Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.84.180403 chicago: Serbyn, Maksym, Todadri Senthil, and Patrick Lee. “Exotic S=1 Spin-Liquid State with Fermionic Excitations on the Triangular Lattice.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2011. https://doi.org/10.1103/PhysRevB.84.180403. ieee: M. Serbyn, T. Senthil, and P. Lee, “Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice,” Physical Review B - Condensed Matter and Materials Physics, vol. 84, no. 18. American Physical Society, 2011. ista: Serbyn M, Senthil T, Lee P. 2011. Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice. Physical Review B - Condensed Matter and Materials Physics. 84(18). mla: Serbyn, Maksym, et al. “Exotic S=1 Spin-Liquid State with Fermionic Excitations on the Triangular Lattice.” Physical Review B - Condensed Matter and Materials Physics, vol. 84, no. 18, American Physical Society, 2011, doi:10.1103/PhysRevB.84.180403. short: M. Serbyn, T. Senthil, P. Lee, Physical Review B - Condensed Matter and Materials Physics 84 (2011). date_created: 2018-12-11T11:49:27Z date_published: 2011-11-03T00:00:00Z date_updated: 2021-01-12T08:22:18Z day: '03' doi: 10.1103/PhysRevB.84.180403 extern: 1 intvolume: ' 84' issue: '18' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1108.3070 month: '11' oa: 1 publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '6432' quality_controlled: 0 status: public title: Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice type: journal_article volume: 84 year: '2011' ... --- _id: '969' abstract: - lang: eng text: We investigate the isotope effect on the London penetration depth of a superconductor which measures n S/m*, the ratio of superfluid density to effective mass. We use a simplified model of electrons weakly coupled to a single phonon frequency ω E, but assume that the energy gap Δ does not have any isotope effect. Nevertheless, we find an isotope effect for n S/m* which is significant if Δ is sufficiently large that it becomes comparable to ω E, a regime of interest to high-T c cuprate superconductors and possibly other families of unconventional superconductors with relatively high T c. Our model is too simple to describe the cuprates and it gives the wrong sign of the isotope effect when compared with experiment, but it is a proof of principle that the isotope effect exists for n S/m* in materials where the pairing gap and T c are not of phonon origin and have no isotope effect. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Patrick full_name: Lee, Patrick last_name: Lee citation: ama: Serbyn M, Lee P. Isotope effect on the superfluid density in conventional and high-temperature superconductors. Physical Review B - Condensed Matter and Materials Physics. 2011;83(2). doi:10.1103/PhysRevB.83.024506 apa: Serbyn, M., & Lee, P. (2011). Isotope effect on the superfluid density in conventional and high-temperature superconductors. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.83.024506 chicago: Serbyn, Maksym, and Patrick Lee. “Isotope Effect on the Superfluid Density in Conventional and High-Temperature Superconductors.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2011. https://doi.org/10.1103/PhysRevB.83.024506. ieee: M. Serbyn and P. Lee, “Isotope effect on the superfluid density in conventional and high-temperature superconductors,” Physical Review B - Condensed Matter and Materials Physics, vol. 83, no. 2. American Physical Society, 2011. ista: Serbyn M, Lee P. 2011. Isotope effect on the superfluid density in conventional and high-temperature superconductors. Physical Review B - Condensed Matter and Materials Physics. 83(2). mla: Serbyn, Maksym, and Patrick Lee. “Isotope Effect on the Superfluid Density in Conventional and High-Temperature Superconductors.” Physical Review B - Condensed Matter and Materials Physics, vol. 83, no. 2, American Physical Society, 2011, doi:10.1103/PhysRevB.83.024506. short: M. Serbyn, P. Lee, Physical Review B - Condensed Matter and Materials Physics 83 (2011). date_created: 2018-12-11T11:49:28Z date_published: 2011-01-19T00:00:00Z date_updated: 2021-01-12T08:22:19Z day: '19' doi: 10.1103/PhysRevB.83.024506 extern: 1 intvolume: ' 83' issue: '2' main_file_link: - open_access: '1' url: https://arxiv.org/abs/1009.2429 month: '01' oa: 1 publication: Physical Review B - Condensed Matter and Materials Physics publication_status: published publisher: American Physical Society publist_id: '6434' quality_controlled: 0 status: public title: Isotope effect on the superfluid density in conventional and high-temperature superconductors type: journal_article volume: 83 year: '2011' ... --- _id: '968' abstract: - lang: eng text: A Reply to the Comment by Andrei Sergeev, M. Reizer, and V. Mitin. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Mikhail full_name: Skvortsov, Mikhail A last_name: Skvortsov - first_name: Andrei full_name: Varlamov, Andrei A last_name: Varlamov - first_name: Victor full_name: Galitski, Victor M last_name: Galitski citation: ama: 'Serbyn M, Skvortsov M, Varlamov A, Galitski V. Serbyn et al. Reply: Physical Review Letters. 2011;106(13). doi:10.1103/PhysRevLett.106.139702' apa: 'Serbyn, M., Skvortsov, M., Varlamov, A., & Galitski, V. (2011). Serbyn et al. Reply: Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.106.139702' chicago: Serbyn, Maksym, Mikhail Skvortsov, Andrei Varlamov, and Victor Galitski. “Serbyn et Al. Reply:” Physical Review Letters. American Physical Society, 2011. https://doi.org/10.1103/PhysRevLett.106.139702. ieee: M. Serbyn, M. Skvortsov, A. Varlamov, and V. Galitski, “Serbyn et al. Reply:,” Physical Review Letters, vol. 106, no. 13. American Physical Society, 2011. ista: 'Serbyn M, Skvortsov M, Varlamov A, Galitski V. 2011. Serbyn et al. Reply: Physical Review Letters. 106(13).' mla: Serbyn, Maksym, et al. “Serbyn et Al. Reply:” Physical Review Letters, vol. 106, no. 13, American Physical Society, 2011, doi:10.1103/PhysRevLett.106.139702. short: M. Serbyn, M. Skvortsov, A. Varlamov, V. Galitski, Physical Review Letters 106 (2011). date_created: 2018-12-11T11:49:27Z date_published: 2011-04-01T00:00:00Z date_updated: 2021-01-12T08:22:19Z day: '01' doi: 10.1103/PhysRevLett.106.139702 extern: 1 intvolume: ' 106' issue: '13' month: '04' publication: Physical Review Letters publication_status: published publisher: American Physical Society publist_id: '6433' quality_controlled: 0 status: public title: 'Serbyn et al. Reply:' type: journal_article volume: 106 year: '2011' ... --- _id: '964' abstract: - lang: eng text: A theory of the fluctuation-induced Nernst efl'ect is developed for a two-dimensional superconductor in a perpendicular magnetic field. First, we derive a simple phenomenological formula for the Nernst coefficient, which naturally explains the giant Nernst signal due to fluctuating Cooper pairs. The latter signal is shown to be large even far from the transition and may exceed by orders of magnitude the Fermi liquid terms. We also present a complete microscopic calculation of the Nernst coefficient for arbitrary magnetic fields and temperatures, which is based on the standard definition of heat current vertices. It is shown that the magnitude and the behavior of the Nernst signal observed experimentally in disordered superconducting films can be well understood on the basis of superconducting fluctuation theory. author: - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 - first_name: Mikhail full_name: Skvortsov, Mikhail A last_name: Skvortsov - first_name: Andrei full_name: Varlamov, Andrei A last_name: Varlamov - first_name: Victor full_name: Galitski, Victor M last_name: Galitski citation: ama: 'Serbyn M, Skvortsov M, Varlamov A, Galitski V. Giant nernst effect due to fluctuating cooper Pairs in superconductors. In: Vol 1134. American Institute of Physics; 2009:140-145. doi:10.1063/1.3149485' apa: Serbyn, M., Skvortsov, M., Varlamov, A., & Galitski, V. (2009). Giant nernst effect due to fluctuating cooper Pairs in superconductors (Vol. 1134, pp. 140–145). Presented at the Landau Memorial Conference on Advances in Theoretical Physics, American Institute of Physics. https://doi.org/10.1063/1.3149485 chicago: Serbyn, Maksym, Mikhail Skvortsov, Andrei Varlamov, and Victor Galitski. “Giant Nernst Effect Due to Fluctuating Cooper Pairs in Superconductors,” 1134:140–45. American Institute of Physics, 2009. https://doi.org/10.1063/1.3149485. ieee: M. Serbyn, M. Skvortsov, A. Varlamov, and V. Galitski, “Giant nernst effect due to fluctuating cooper Pairs in superconductors,” presented at the Landau Memorial Conference on Advances in Theoretical Physics, 2009, vol. 1134, pp. 140–145. ista: Serbyn M, Skvortsov M, Varlamov A, Galitski V. 2009. Giant nernst effect due to fluctuating cooper Pairs in superconductors. Landau Memorial Conference on Advances in Theoretical Physics vol. 1134, 140–145. mla: Serbyn, Maksym, et al. Giant Nernst Effect Due to Fluctuating Cooper Pairs in Superconductors. Vol. 1134, American Institute of Physics, 2009, pp. 140–45, doi:10.1063/1.3149485. short: M. Serbyn, M. Skvortsov, A. Varlamov, V. Galitski, in:, American Institute of Physics, 2009, pp. 140–145. conference: name: Landau Memorial Conference on Advances in Theoretical Physics date_created: 2018-12-11T11:49:26Z date_published: 2009-01-01T00:00:00Z date_updated: 2021-01-12T08:22:17Z day: '01' doi: 10.1063/1.3149485 extern: 1 intvolume: ' 1134' month: '01' page: 140 - 145 publication_status: published publisher: American Institute of Physics publist_id: '6435' quality_controlled: 0 status: public title: Giant nernst effect due to fluctuating cooper Pairs in superconductors type: conference volume: 1134 year: '2009' ... --- _id: '965' abstract: - lang: eng text: We give many examples of applying Bogoliubov's forest formula to iterative solutions of various nonlinear equations. The same formula describes an extremely wide class of objects, from an ordinary quadratic equation to renormalization in quantum field theory. acknowledgement: |- This work is supported in part by the Dynasty Foundation (M. N. S.), the Russian Foundation for Basic Research (Grant No s. 07-02-00878 and 07-02-00645), a joint grant (Grant No. 06-01-92059-CE), the NWO (Project No. 047.011.2004.026), INTAS (Grant No. 05-1000008-7865), the Program for Supporting Leading Scientific School s (Grant No. NSh-8004.2006.2), and also by a project (Project No. ANR-05-BLAN-0029-01, A. Yu. M.). author: - first_name: Alexei full_name: Morozov, Alexei Y last_name: Morozov - first_name: Maksym full_name: Maksym Serbyn id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Morozov A, Serbyn M. Nonlinear algebra and Bogoliubov’s recursion. Theoretical and Mathematical Physics. 2008;154(2):270-293. doi:10.1007/s11232-008-0026-7 apa: Morozov, A., & Serbyn, M. (2008). Nonlinear algebra and Bogoliubov’s recursion. Theoretical and Mathematical Physics. Elsevier. https://doi.org/10.1007/s11232-008-0026-7 chicago: Morozov, Alexei, and Maksym Serbyn. “Nonlinear Algebra and Bogoliubov’s Recursion.” Theoretical and Mathematical Physics. Elsevier, 2008. https://doi.org/10.1007/s11232-008-0026-7. ieee: A. Morozov and M. Serbyn, “Nonlinear algebra and Bogoliubov’s recursion,” Theoretical and Mathematical Physics, vol. 154, no. 2. Elsevier, pp. 270–293, 2008. ista: Morozov A, Serbyn M. 2008. Nonlinear algebra and Bogoliubov’s recursion. Theoretical and Mathematical Physics. 154(2), 270–293. mla: Morozov, Alexei, and Maksym Serbyn. “Nonlinear Algebra and Bogoliubov’s Recursion.” Theoretical and Mathematical Physics, vol. 154, no. 2, Elsevier, 2008, pp. 270–93, doi:10.1007/s11232-008-0026-7. short: A. Morozov, M. Serbyn, Theoretical and Mathematical Physics 154 (2008) 270–293. date_created: 2018-12-11T11:49:26Z date_published: 2008-01-01T00:00:00Z date_updated: 2021-01-12T08:22:17Z day: '01' doi: 10.1007/s11232-008-0026-7 extern: 1 intvolume: ' 154' issue: '2' main_file_link: - open_access: '1' url: https://arxiv.org/abs/hep-th/0703258 month: '01' oa: 1 page: 270 - 293 publication: Theoretical and Mathematical Physics publication_status: published publisher: Elsevier publist_id: '6437' quality_controlled: 0 status: public title: Nonlinear algebra and Bogoliubov's recursion type: journal_article volume: 154 year: '2008' ...