--- _id: '10355' abstract: - lang: eng text: The molecular machinery of life is largely created via self-organisation of individual molecules into functional assemblies. Minimal coarse-grained models, in which a whole macromolecule is represented by a small number of particles, can be of great value in identifying the main driving forces behind self-organisation in cell biology. Such models can incorporate data from both molecular and continuum scales, and their results can be directly compared to experiments. Here we review the state of the art of models for studying the formation and biological function of macromolecular assemblies in living organisms. We outline the key ingredients of each model and their main findings. We illustrate the contribution of this class of simulations to identifying the physical mechanisms behind life and diseases, and discuss their future developments. acknowledgement: We acknowledge funding from EPSRC (A.E.H. and A.Š.), the Academy of Medical Sciences (J.K. and A.Š.), the Wellcome Trust (J.K. and A.Š.), and the Royal Society (A.Š.). We thank Shiladitya Banerjee and Nikola Ojkic for critically reading the manuscript, and Claudia Flandoli for helping us with figures and illustrations. article_processing_charge: No article_type: original author: - first_name: Anne E full_name: Hafner, Anne E last_name: Hafner - first_name: Johannes full_name: Krausser, Johannes last_name: Krausser - first_name: Anđela full_name: Šarić, Anđela id: bf63d406-f056-11eb-b41d-f263a6566d8b last_name: Šarić orcid: 0000-0002-7854-2139 citation: ama: Hafner AE, Krausser J, Šarić A. Minimal coarse-grained models for molecular self-organisation in biology. Current Opinion in Structural Biology. 2019;58:43-52. doi:10.1016/j.sbi.2019.05.018 apa: Hafner, A. E., Krausser, J., & Šarić, A. (2019). Minimal coarse-grained models for molecular self-organisation in biology. Current Opinion in Structural Biology. Elsevier. https://doi.org/10.1016/j.sbi.2019.05.018 chicago: Hafner, Anne E, Johannes Krausser, and Anđela Šarić. “Minimal Coarse-Grained Models for Molecular Self-Organisation in Biology.” Current Opinion in Structural Biology. Elsevier, 2019. https://doi.org/10.1016/j.sbi.2019.05.018. ieee: A. E. Hafner, J. Krausser, and A. Šarić, “Minimal coarse-grained models for molecular self-organisation in biology,” Current Opinion in Structural Biology, vol. 58. Elsevier, pp. 43–52, 2019. ista: Hafner AE, Krausser J, Šarić A. 2019. Minimal coarse-grained models for molecular self-organisation in biology. Current Opinion in Structural Biology. 58, 43–52. mla: Hafner, Anne E., et al. “Minimal Coarse-Grained Models for Molecular Self-Organisation in Biology.” Current Opinion in Structural Biology, vol. 58, Elsevier, 2019, pp. 43–52, doi:10.1016/j.sbi.2019.05.018. short: A.E. Hafner, J. Krausser, A. Šarić, Current Opinion in Structural Biology 58 (2019) 43–52. date_created: 2021-11-26T11:33:21Z date_published: 2019-06-18T00:00:00Z date_updated: 2021-11-26T11:54:25Z day: '18' doi: 10.1016/j.sbi.2019.05.018 extern: '1' external_id: pmid: - '31226513' intvolume: ' 58' keyword: - molecular biology - structural biology language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1906.09349 month: '06' oa: 1 oa_version: Preprint page: 43-52 pmid: 1 publication: Current Opinion in Structural Biology publication_identifier: issn: - 0959-440X publication_status: published publisher: Elsevier quality_controlled: '1' scopus_import: '1' status: public title: Minimal coarse-grained models for molecular self-organisation in biology type: journal_article user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9 volume: 58 year: '2019' ... --- _id: '10621' abstract: - lang: eng text: Twisted bilayer graphene has recently emerged as a platform for hosting correlated phenomena. For twist angles near θ ≈ 1.1°, the low-energy electronic structure of twisted bilayer graphene features isolated bands with a flat dispersion1,2. Recent experiments have observed a variety of low-temperature phases that appear to be driven by electron interactions, including insulating states, superconductivity and magnetism3,4,5,6. Here we report electrical transport measurements up to room temperature for twist angles varying between 0.75° and 2°. We find that the resistivity, ρ, scales linearly with temperature, T, over a wide range of T before falling again owing to interband activation. The T-linear response is much larger than observed in monolayer graphene for all measured devices, and in particular increases by more than three orders of magnitude in the range where the flat band exists. Our results point to the dominant role of electron–phonon scattering in twisted bilayer graphene, with possible implications for the origin of the observed superconductivity. acknowledgement: The authors thank S. Das Sarma and F. Wu for sharing their unpublished theoretical results, and acknowledge further discussions with L. Balents and T. Senthil. Work at both Columbia and UCSB was funded by the Army Research Office under award W911NF-17-1-0323. Sample device design and fabrication was partially supported by DoE Pro-QM EFRC (DE-SC0019443). A.F.Y. and C.R.D. separately acknowledge the support of the David and Lucile Packard Foundation. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan and the CREST (JPMJCR15F3), JST. A portion of this work was carried out at the KITP, Santa Barbara, supported by the National Science Foundation under grant number NSF PHY-1748958. article_processing_charge: No article_type: original author: - first_name: Hryhoriy full_name: Polshyn, Hryhoriy id: edfc7cb1-526e-11ec-b05a-e6ecc27e4e48 last_name: Polshyn orcid: 0000-0001-8223-8896 - first_name: Matthew full_name: Yankowitz, Matthew last_name: Yankowitz - first_name: Shaowen full_name: Chen, Shaowen last_name: Chen - first_name: Yuxuan full_name: Zhang, Yuxuan last_name: Zhang - first_name: K. full_name: Watanabe, K. last_name: Watanabe - first_name: T. full_name: Taniguchi, T. last_name: Taniguchi - first_name: Cory R. full_name: Dean, Cory R. last_name: Dean - first_name: Andrea F. full_name: Young, Andrea F. last_name: Young citation: ama: Polshyn H, Yankowitz M, Chen S, et al. Large linear-in-temperature resistivity in twisted bilayer graphene. Nature Physics. 2019;15(10):1011-1016. doi:10.1038/s41567-019-0596-3 apa: Polshyn, H., Yankowitz, M., Chen, S., Zhang, Y., Watanabe, K., Taniguchi, T., … Young, A. F. (2019). Large linear-in-temperature resistivity in twisted bilayer graphene. Nature Physics. Springer Nature. https://doi.org/10.1038/s41567-019-0596-3 chicago: Polshyn, Hryhoriy, Matthew Yankowitz, Shaowen Chen, Yuxuan Zhang, K. Watanabe, T. Taniguchi, Cory R. Dean, and Andrea F. Young. “Large Linear-in-Temperature Resistivity in Twisted Bilayer Graphene.” Nature Physics. Springer Nature, 2019. https://doi.org/10.1038/s41567-019-0596-3. ieee: H. Polshyn et al., “Large linear-in-temperature resistivity in twisted bilayer graphene,” Nature Physics, vol. 15, no. 10. Springer Nature, pp. 1011–1016, 2019. ista: Polshyn H, Yankowitz M, Chen S, Zhang Y, Watanabe K, Taniguchi T, Dean CR, Young AF. 2019. Large linear-in-temperature resistivity in twisted bilayer graphene. Nature Physics. 15(10), 1011–1016. mla: Polshyn, Hryhoriy, et al. “Large Linear-in-Temperature Resistivity in Twisted Bilayer Graphene.” Nature Physics, vol. 15, no. 10, Springer Nature, 2019, pp. 1011–16, doi:10.1038/s41567-019-0596-3. short: H. Polshyn, M. Yankowitz, S. Chen, Y. Zhang, K. Watanabe, T. Taniguchi, C.R. Dean, A.F. Young, Nature Physics 15 (2019) 1011–1016. date_created: 2022-01-13T15:00:58Z date_published: 2019-08-05T00:00:00Z date_updated: 2022-01-20T09:33:38Z day: '05' doi: 10.1038/s41567-019-0596-3 extern: '1' external_id: arxiv: - '1902.00763' intvolume: ' 15' issue: '10' keyword: - general physics and astronomy language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1902.00763 month: '08' oa: 1 oa_version: Preprint page: 1011-1016 publication: Nature Physics publication_identifier: eissn: - 1745-2481 issn: - 1745-2473 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: Large linear-in-temperature resistivity in twisted bilayer graphene type: journal_article user_id: ea97e931-d5af-11eb-85d4-e6957dddbf17 volume: 15 year: '2019' ... --- _id: '10622' abstract: - lang: eng text: We demonstrate a method for manipulating small ensembles of vortices in multiply connected superconducting structures. A micron-size magnetic particle attached to the tip of a silicon cantilever is used to locally apply magnetic flux through the superconducting structure. By scanning the tip over the surface of the device and by utilizing the dynamical coupling between the vortices and the cantilever, a high-resolution spatial map of the different vortex configurations is obtained. Moving the tip to a particular location in the map stabilizes a distinct multivortex configuration. Thus, the scanning of the tip over a particular trajectory in space permits nontrivial operations to be performed, such as braiding of individual vortices within a larger vortex ensemble—a key capability required by many proposals for topological quantum computing. acknowledgement: We are grateful to Nadya Mason, Taylor Hughes, and Alexey Bezryadin for useful discussions. This work was supported by the DOE Basic Energy Sciences under DE-SC0012649 and the Department of Physics and the Frederick Seitz Materials Research Laboratory Central Facilities at the University of Illinois. article_processing_charge: No article_type: original author: - first_name: Hryhoriy full_name: Polshyn, Hryhoriy id: edfc7cb1-526e-11ec-b05a-e6ecc27e4e48 last_name: Polshyn orcid: 0000-0001-8223-8896 - first_name: Tyler full_name: Naibert, Tyler last_name: Naibert - first_name: Raffi full_name: Budakian, Raffi last_name: Budakian citation: ama: Polshyn H, Naibert T, Budakian R. Manipulating multivortex states in superconducting structures. Nano Letters. 2019;19(8):5476-5482. doi:10.1021/acs.nanolett.9b01983 apa: Polshyn, H., Naibert, T., & Budakian, R. (2019). Manipulating multivortex states in superconducting structures. Nano Letters. American Chemical Society. https://doi.org/10.1021/acs.nanolett.9b01983 chicago: Polshyn, Hryhoriy, Tyler Naibert, and Raffi Budakian. “Manipulating Multivortex States in Superconducting Structures.” Nano Letters. American Chemical Society, 2019. https://doi.org/10.1021/acs.nanolett.9b01983. ieee: H. Polshyn, T. Naibert, and R. Budakian, “Manipulating multivortex states in superconducting structures,” Nano Letters, vol. 19, no. 8. American Chemical Society, pp. 5476–5482, 2019. ista: Polshyn H, Naibert T, Budakian R. 2019. Manipulating multivortex states in superconducting structures. Nano Letters. 19(8), 5476–5482. mla: Polshyn, Hryhoriy, et al. “Manipulating Multivortex States in Superconducting Structures.” Nano Letters, vol. 19, no. 8, American Chemical Society, 2019, pp. 5476–82, doi:10.1021/acs.nanolett.9b01983. short: H. Polshyn, T. Naibert, R. Budakian, Nano Letters 19 (2019) 5476–5482. date_created: 2022-01-13T15:11:14Z date_published: 2019-06-27T00:00:00Z date_updated: 2022-01-13T15:41:24Z day: '27' doi: 10.1021/acs.nanolett.9b01983 extern: '1' external_id: arxiv: - '1905.06303' pmid: - '31246034' intvolume: ' 19' issue: '8' keyword: - mechanical engineering - condensed matter physics - general materials science - general chemistry - bioengineering language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1905.06303 month: '06' oa: 1 oa_version: Preprint page: 5476-5482 pmid: 1 publication: Nano Letters publication_identifier: eissn: - 1530-6992 issn: - 1530-6984 publication_status: published publisher: American Chemical Society quality_controlled: '1' scopus_import: '1' status: public title: Manipulating multivortex states in superconducting structures type: journal_article user_id: ea97e931-d5af-11eb-85d4-e6957dddbf17 volume: 19 year: '2019' ... --- _id: '10625' abstract: - lang: eng text: The discovery of superconductivity and exotic insulating phases in twisted bilayer graphene has established this material as a model system of strongly correlated electrons. To achieve superconductivity, the two layers of graphene need to be at a very precise angle with respect to each other. Yankowitz et al. now show that another experimental knob, hydrostatic pressure, can be used to tune the phase diagram of twisted bilayer graphene (see the Perspective by Feldman). Applying pressure increased the coupling between the layers, which shifted the superconducting transition to higher angles and somewhat higher temperatures. acknowledgement: We thank J. Zhu and H. Zhou for experimental assistance and D. Shahar, A. Millis, O. Vafek, M. Zaletel, L. Balents, C. Xu, A. Bernevig, L. Fu, M. Koshino, and P. Moon for helpful discussions. article_processing_charge: No article_type: original author: - first_name: Matthew full_name: Yankowitz, Matthew last_name: Yankowitz - first_name: Shaowen full_name: Chen, Shaowen last_name: Chen - first_name: Hryhoriy full_name: Polshyn, Hryhoriy id: edfc7cb1-526e-11ec-b05a-e6ecc27e4e48 last_name: Polshyn orcid: 0000-0001-8223-8896 - first_name: Yuxuan full_name: Zhang, Yuxuan last_name: Zhang - first_name: K. full_name: Watanabe, K. last_name: Watanabe - first_name: T. full_name: Taniguchi, T. last_name: Taniguchi - first_name: David full_name: Graf, David last_name: Graf - first_name: Andrea F. full_name: Young, Andrea F. last_name: Young - first_name: Cory R. full_name: Dean, Cory R. last_name: Dean citation: ama: Yankowitz M, Chen S, Polshyn H, et al. Tuning superconductivity in twisted bilayer graphene. Science. 2019;363(6431):1059-1064. doi:10.1126/science.aav1910 apa: Yankowitz, M., Chen, S., Polshyn, H., Zhang, Y., Watanabe, K., Taniguchi, T., … Dean, C. R. (2019). Tuning superconductivity in twisted bilayer graphene. Science. American Association for the Advancement of Science (AAAS). https://doi.org/10.1126/science.aav1910 chicago: Yankowitz, Matthew, Shaowen Chen, Hryhoriy Polshyn, Yuxuan Zhang, K. Watanabe, T. Taniguchi, David Graf, Andrea F. Young, and Cory R. Dean. “Tuning Superconductivity in Twisted Bilayer Graphene.” Science. American Association for the Advancement of Science (AAAS), 2019. https://doi.org/10.1126/science.aav1910. ieee: M. Yankowitz et al., “Tuning superconductivity in twisted bilayer graphene,” Science, vol. 363, no. 6431. American Association for the Advancement of Science (AAAS), pp. 1059–1064, 2019. ista: Yankowitz M, Chen S, Polshyn H, Zhang Y, Watanabe K, Taniguchi T, Graf D, Young AF, Dean CR. 2019. Tuning superconductivity in twisted bilayer graphene. Science. 363(6431), 1059–1064. mla: Yankowitz, Matthew, et al. “Tuning Superconductivity in Twisted Bilayer Graphene.” Science, vol. 363, no. 6431, American Association for the Advancement of Science (AAAS), 2019, pp. 1059–64, doi:10.1126/science.aav1910. short: M. Yankowitz, S. Chen, H. Polshyn, Y. Zhang, K. Watanabe, T. Taniguchi, D. Graf, A.F. Young, C.R. Dean, Science 363 (2019) 1059–1064. date_created: 2022-01-14T12:14:58Z date_published: 2019-01-24T00:00:00Z date_updated: 2022-01-14T13:48:32Z day: '24' doi: 10.1126/science.aav1910 extern: '1' external_id: arxiv: - '1808.07865' pmid: - '30679385 ' intvolume: ' 363' issue: '6431' keyword: - multidisciplinary language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1808.07865 month: '01' oa: 1 oa_version: Preprint page: 1059-1064 pmid: 1 publication: Science publication_identifier: eissn: - 1095-9203 issn: - 0036-8075 publication_status: published publisher: American Association for the Advancement of Science (AAAS) quality_controlled: '1' scopus_import: '1' status: public title: Tuning superconductivity in twisted bilayer graphene type: journal_article user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9 volume: 363 year: '2019' ... --- _id: '10664' abstract: - lang: eng text: "Since the discovery of correlated insulators and superconductivity in magic-angle twisted bilayer graphene (tBLG) ([1, 2], JCCM April 2018), theorists have been excitedly pursuing the alluring mix of band topology, symmetry breaking, Mott insulators and superconductivity at play, as well as the potential relation (if any) to high-Tc physics. Now a new stream\r\nof experimental work is arriving which further enriches the story. To briefly recap Episodes 1 and 2 (JCCM April and November 2018), when two graphene layers are stacked with a small rotational mismatch θ, the resulting long-wavelength moire pattern leads to a superlattice potential which reconstructs the low energy band structure. When θ approaches the “magic-angle” θM ∼ 1 ◦, the band structure features eight nearly-flat bands which fill when the electron number per moire unit cell, n/n0, lies between −4 < n/n0 < 4. The bands can be counted as 8 = 2 × 2 × 2: for each spin (2×) and valley (2×) characteristic of monolayergraphene, tBLG has has 2× flat bands which cross at mini-Dirac points." article_processing_charge: No article_type: original author: - first_name: Mathew full_name: Yankowitz, Mathew last_name: Yankowitz - first_name: Shaowen full_name: Chen, Shaowen last_name: Chen - first_name: Hryhoriy full_name: Polshyn, Hryhoriy id: edfc7cb1-526e-11ec-b05a-e6ecc27e4e48 last_name: Polshyn orcid: 0000-0001-8223-8896 - first_name: K. full_name: Watanabe, K. last_name: Watanabe - first_name: T. full_name: Taniguchi, T. last_name: Taniguchi - first_name: David full_name: Graf, David last_name: Graf - first_name: Andrea F. full_name: Young, Andrea F. last_name: Young - first_name: Cory R. full_name: Dean, Cory R. last_name: Dean - first_name: Aaron L. full_name: Sharpe, Aaron L. last_name: Sharpe - first_name: E.J. full_name: Fox, E.J. last_name: Fox - first_name: A.W. full_name: Barnard, A.W. last_name: Barnard - first_name: Joe full_name: Finney, Joe last_name: Finney citation: ama: Yankowitz M, Chen S, Polshyn H, et al. New correlated phenomena in magic-angle twisted bilayer graphene/s. Journal Club for Condensed Matter Physics. 2019;03. doi:10.36471/jccm_february_2019_03 apa: Yankowitz, M., Chen, S., Polshyn, H., Watanabe, K., Taniguchi, T., Graf, D., … Finney, J. (2019). New correlated phenomena in magic-angle twisted bilayer graphene/s. Journal Club for Condensed Matter Physics. Simons Foundation ; University of California, Riverside. https://doi.org/10.36471/jccm_february_2019_03 chicago: Yankowitz, Mathew, Shaowen Chen, Hryhoriy Polshyn, K. Watanabe, T. Taniguchi, David Graf, Andrea F. Young, et al. “New Correlated Phenomena in Magic-Angle Twisted Bilayer Graphene/S.” Journal Club for Condensed Matter Physics. Simons Foundation ; University of California, Riverside, 2019. https://doi.org/10.36471/jccm_february_2019_03. ieee: M. Yankowitz et al., “New correlated phenomena in magic-angle twisted bilayer graphene/s,” Journal Club for Condensed Matter Physics, vol. 03. Simons Foundation ; University of California, Riverside, 2019. ista: Yankowitz M, Chen S, Polshyn H, Watanabe K, Taniguchi T, Graf D, Young AF, Dean CR, Sharpe AL, Fox EJ, Barnard AW, Finney J. 2019. New correlated phenomena in magic-angle twisted bilayer graphene/s. Journal Club for Condensed Matter Physics. 03. mla: Yankowitz, Mathew, et al. “New Correlated Phenomena in Magic-Angle Twisted Bilayer Graphene/S.” Journal Club for Condensed Matter Physics, vol. 03, Simons Foundation ; University of California, Riverside, 2019, doi:10.36471/jccm_february_2019_03. short: M. Yankowitz, S. Chen, H. Polshyn, K. Watanabe, T. Taniguchi, D. Graf, A.F. Young, C.R. Dean, A.L. Sharpe, E.J. Fox, A.W. Barnard, J. Finney, Journal Club for Condensed Matter Physics 03 (2019). date_created: 2022-01-25T15:09:58Z date_published: 2019-02-28T00:00:00Z date_updated: 2022-01-25T15:56:39Z day: '28' doi: 10.36471/jccm_february_2019_03 intvolume: ' 3' language: - iso: eng main_file_link: - open_access: '1' url: https://www.condmatjclub.org/?p=3541 month: '02' oa: 1 oa_version: Published Version publication: Journal Club for Condensed Matter Physics publication_status: published publisher: Simons Foundation ; University of California, Riverside quality_controlled: '1' status: public title: New correlated phenomena in magic-angle twisted bilayer graphene/s type: journal_article user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9 volume: '03' year: '2019' ... --- _id: '10619' abstract: - lang: eng text: The quantum anomalous Hall (QAH) effect combines topology and magnetism to produce precisely quantized Hall resistance at zero magnetic field. We report the observation of a QAH effect in twisted bilayer graphene aligned to hexagonal boron nitride. The effect is driven by intrinsic strong interactions, which polarize the electrons into a single spin- and valley-resolved moiré miniband with Chern number C = 1. In contrast to magnetically doped systems, the measured transport energy gap is larger than the Curie temperature for magnetic ordering, and quantization to within 0.1% of the von Klitzing constant persists to temperatures of several kelvin at zero magnetic field. Electrical currents as small as 1 nanoampere controllably switch the magnetic order between states of opposite polarization, forming an electrically rewritable magnetic memory. acknowledgement: The authors acknowledge discussions with A. Macdonald, Y. Saito, and M. Zaletel. article_processing_charge: No article_type: original author: - first_name: M. full_name: Serlin, M. last_name: Serlin - first_name: C. L. full_name: Tschirhart, C. L. last_name: Tschirhart - first_name: Hryhoriy full_name: Polshyn, Hryhoriy id: edfc7cb1-526e-11ec-b05a-e6ecc27e4e48 last_name: Polshyn orcid: 0000-0001-8223-8896 - first_name: Y. full_name: Zhang, Y. last_name: Zhang - first_name: J. full_name: Zhu, J. last_name: Zhu - first_name: K. full_name: Watanabe, K. last_name: Watanabe - first_name: T. full_name: Taniguchi, T. last_name: Taniguchi - first_name: L. full_name: Balents, L. last_name: Balents - first_name: A. F. full_name: Young, A. F. last_name: Young citation: ama: Serlin M, Tschirhart CL, Polshyn H, et al. Intrinsic quantized anomalous Hall effect in a moiré heterostructure. Science. 2019;367(6480):900-903. doi:10.1126/science.aay5533 apa: Serlin, M., Tschirhart, C. L., Polshyn, H., Zhang, Y., Zhu, J., Watanabe, K., … Young, A. F. (2019). Intrinsic quantized anomalous Hall effect in a moiré heterostructure. Science. American Association for the Advancement of Science. https://doi.org/10.1126/science.aay5533 chicago: Serlin, M., C. L. Tschirhart, Hryhoriy Polshyn, Y. Zhang, J. Zhu, K. Watanabe, T. Taniguchi, L. Balents, and A. F. Young. “Intrinsic Quantized Anomalous Hall Effect in a Moiré Heterostructure.” Science. American Association for the Advancement of Science, 2019. https://doi.org/10.1126/science.aay5533. ieee: M. Serlin et al., “Intrinsic quantized anomalous Hall effect in a moiré heterostructure,” Science, vol. 367, no. 6480. American Association for the Advancement of Science, pp. 900–903, 2019. ista: Serlin M, Tschirhart CL, Polshyn H, Zhang Y, Zhu J, Watanabe K, Taniguchi T, Balents L, Young AF. 2019. Intrinsic quantized anomalous Hall effect in a moiré heterostructure. Science. 367(6480), 900–903. mla: Serlin, M., et al. “Intrinsic Quantized Anomalous Hall Effect in a Moiré Heterostructure.” Science, vol. 367, no. 6480, American Association for the Advancement of Science, 2019, pp. 900–03, doi:10.1126/science.aay5533. short: M. Serlin, C.L. Tschirhart, H. Polshyn, Y. Zhang, J. Zhu, K. Watanabe, T. Taniguchi, L. Balents, A.F. Young, Science 367 (2019) 900–903. date_created: 2022-01-13T14:21:32Z date_published: 2019-12-19T00:00:00Z date_updated: 2023-02-21T16:00:09Z day: '19' doi: 10.1126/science.aay5533 extern: '1' external_id: arxiv: - '1907.00261' pmid: - '31857492' intvolume: ' 367' issue: '6480' keyword: - multidisciplinary language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1907.00261 month: '12' oa: 1 oa_version: Preprint page: 900-903 pmid: 1 publication: Science publication_identifier: eissn: - 1095-9203 issn: - 0036-8075 publication_status: published publisher: American Association for the Advancement of Science quality_controlled: '1' related_material: record: - id: '10697' relation: other status: public - id: '10698' relation: other status: public - id: '10699' relation: other status: public scopus_import: '1' status: public title: Intrinsic quantized anomalous Hall effect in a moiré heterostructure type: journal_article user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9 volume: 367 year: '2019' ... --- _id: '10724' abstract: - lang: eng text: Twisted bilayer graphene (tBLG) near the flat band condition is a versatile new platform for the study of correlated physics in 2D. Resistive states have been observed at several commensurate fillings of the flat miniband, along with superconducting states near half filling. To better understand the electronic structure of this system, we study electronic transport of graphite gated superconducting tBLG devices in the normal regime. At high magnetic fields, we observe full lifting of the spin and valley degeneracy. The transitions in the splitting of this four-fold degeneracy as a function of carrier density indicate Landau level (LL) crossings, which tilted field measurements show occur between LLs with different valley polarization. Similar LL structure measured in two devices, one with twist angle θ=1.08° at ambient pressure and one at θ=1.27° and 1.33GPa, suggests that the dimensionless combination of twist angle and interlayer coupling controls the relevant details of the band structure. In addition, we find that the temperature dependence of the resistance at B=0 shows linear growth at several hundred Ohm/K in a broad range of temperatures. We discuss the implications for modeling the scattering processes in this system. alternative_title: - Bulletin of the American Physical Society article_number: V14.00008 article_processing_charge: No author: - first_name: Hryhoriy full_name: Polshyn, Hryhoriy id: edfc7cb1-526e-11ec-b05a-e6ecc27e4e48 last_name: Polshyn orcid: 0000-0001-8223-8896 - first_name: Yuxuan full_name: Zhang, Yuxuan last_name: Zhang - first_name: Matthew full_name: Yankowitz, Matthew last_name: Yankowitz - first_name: Shaowen full_name: Chen, Shaowen last_name: Chen - first_name: Takashi full_name: Taniguchi, Takashi last_name: Taniguchi - first_name: Kenji full_name: Watanabe, Kenji last_name: Watanabe - first_name: David E. full_name: Graf, David E. last_name: Graf - first_name: Cory R. full_name: Dean, Cory R. last_name: Dean - first_name: Andrea full_name: Young, Andrea last_name: Young citation: ama: 'Polshyn H, Zhang Y, Yankowitz M, et al. Normal state transport in superconducting twisted bilayer graphene. In: APS March Meeting 2019. Vol 64. American Physical Society; 2019.' apa: 'Polshyn, H., Zhang, Y., Yankowitz, M., Chen, S., Taniguchi, T., Watanabe, K., … Young, A. (2019). Normal state transport in superconducting twisted bilayer graphene. In APS March Meeting 2019 (Vol. 64). Boston, MA, United States: American Physical Society.' chicago: Polshyn, Hryhoriy, Yuxuan Zhang, Matthew Yankowitz, Shaowen Chen, Takashi Taniguchi, Kenji Watanabe, David E. Graf, Cory R. Dean, and Andrea Young. “Normal State Transport in Superconducting Twisted Bilayer Graphene.” In APS March Meeting 2019, Vol. 64. American Physical Society, 2019. ieee: H. Polshyn et al., “Normal state transport in superconducting twisted bilayer graphene,” in APS March Meeting 2019, Boston, MA, United States, 2019, vol. 64, no. 2. ista: 'Polshyn H, Zhang Y, Yankowitz M, Chen S, Taniguchi T, Watanabe K, Graf DE, Dean CR, Young A. 2019. Normal state transport in superconducting twisted bilayer graphene. APS March Meeting 2019. APS: American Physical Society, Bulletin of the American Physical Society, vol. 64, V14.00008.' mla: Polshyn, Hryhoriy, et al. “Normal State Transport in Superconducting Twisted Bilayer Graphene.” APS March Meeting 2019, vol. 64, no. 2, V14.00008, American Physical Society, 2019. short: H. Polshyn, Y. Zhang, M. Yankowitz, S. Chen, T. Taniguchi, K. Watanabe, D.E. Graf, C.R. Dean, A. Young, in:, APS March Meeting 2019, American Physical Society, 2019. conference: end_date: 2019-03-08 location: Boston, MA, United States name: 'APS: American Physical Society' start_date: 2019-03-04 date_created: 2022-02-04T12:25:04Z date_published: 2019-03-01T00:00:00Z date_updated: 2022-02-08T10:23:13Z day: '01' extern: '1' intvolume: ' 64' issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://meetings.aps.org/Meeting/MAR19/Session/V14.8 month: '03' oa: 1 oa_version: Published Version publication: APS March Meeting 2019 publication_identifier: issn: - 0003-0503 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Normal state transport in superconducting twisted bilayer graphene type: conference user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9 volume: 64 year: '2019' ... --- _id: '10722' abstract: - lang: eng text: Bilayer graphene, rotationally faulted to ~1.1 degree misalignment, has recently been shown to host superconducting and resistive states associated with the formation of a flat electronic band. While numerous theories exist for the origins of both states, direct validation of these theories remains an outstanding experimental problem. Here, we focus on the resistive states occurring at commensurate filling (1/2, 1/4, and 3/4) of the two lowest superlattice bands. We test theoretical proposals that these states arise due to broken spin—and/or valley—symmetry by performing direct magnetic imaging with nanoscale SQUID-on-tip microscopy. This technique provides single-spin resolved magnetometry on sub-100nm length scales. I will present imaging data from our 4.2K nSOT microscope on graphite-gated twisted bilayers near the flat band condition and discuss the implications for the physics of the commensurate resistive states. alternative_title: - Bulletin of the American Physical Society article_number: L14.00006 article_processing_charge: No author: - first_name: Marec full_name: Serlin, Marec last_name: Serlin - first_name: Charles full_name: Tschirhart, Charles last_name: Tschirhart - first_name: Hryhoriy full_name: Polshyn, Hryhoriy id: edfc7cb1-526e-11ec-b05a-e6ecc27e4e48 last_name: Polshyn orcid: 0000-0001-8223-8896 - first_name: Jiacheng full_name: Zhu, Jiacheng last_name: Zhu - first_name: Martin E. full_name: Huber, Martin E. last_name: Huber - first_name: Andrea full_name: Young, Andrea last_name: Young citation: ama: 'Serlin M, Tschirhart C, Polshyn H, Zhu J, Huber ME, Young A. Direct Imaging of magnetic structure in twisted bilayer graphene with scanning nanoSQUID-On-Tip microscopy. In: APS March Meeting 2019. Vol 64. American Physical Society; 2019.' apa: 'Serlin, M., Tschirhart, C., Polshyn, H., Zhu, J., Huber, M. E., & Young, A. (2019). Direct Imaging of magnetic structure in twisted bilayer graphene with scanning nanoSQUID-On-Tip microscopy. In APS March Meeting 2019 (Vol. 64). Boston, MA, United States: American Physical Society.' chicago: Serlin, Marec, Charles Tschirhart, Hryhoriy Polshyn, Jiacheng Zhu, Martin E. Huber, and Andrea Young. “Direct Imaging of Magnetic Structure in Twisted Bilayer Graphene with Scanning NanoSQUID-On-Tip Microscopy.” In APS March Meeting 2019, Vol. 64. American Physical Society, 2019. ieee: M. Serlin, C. Tschirhart, H. Polshyn, J. Zhu, M. E. Huber, and A. Young, “Direct Imaging of magnetic structure in twisted bilayer graphene with scanning nanoSQUID-On-Tip microscopy,” in APS March Meeting 2019, Boston, MA, United States, 2019, vol. 64, no. 2. ista: 'Serlin M, Tschirhart C, Polshyn H, Zhu J, Huber ME, Young A. 2019. Direct Imaging of magnetic structure in twisted bilayer graphene with scanning nanoSQUID-On-Tip microscopy. APS March Meeting 2019. APS: American Physical Society, Bulletin of the American Physical Society, vol. 64, L14.00006.' mla: Serlin, Marec, et al. “Direct Imaging of Magnetic Structure in Twisted Bilayer Graphene with Scanning NanoSQUID-On-Tip Microscopy.” APS March Meeting 2019, vol. 64, no. 2, L14.00006, American Physical Society, 2019. short: M. Serlin, C. Tschirhart, H. Polshyn, J. Zhu, M.E. Huber, A. Young, in:, APS March Meeting 2019, American Physical Society, 2019. conference: end_date: 2019-03-08 location: Boston, MA, United States name: 'APS: American Physical Society' start_date: 2019-03-04 date_created: 2022-02-04T11:54:21Z date_published: 2019-03-01T00:00:00Z date_updated: 2022-02-08T10:25:30Z day: '01' extern: '1' intvolume: ' 64' issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://meetings.aps.org/Meeting/MAR19/Session/L14.6 month: '03' oa: 1 oa_version: Published Version publication: APS March Meeting 2019 publication_identifier: issn: - 0003-0503 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Direct Imaging of magnetic structure in twisted bilayer graphene with scanning nanoSQUID-On-Tip microscopy type: conference user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9 volume: 64 year: '2019' ... --- _id: '10725' abstract: - lang: eng text: Bilayer graphene with ~ 1.1 degrees twist mismatch between the layers hosts a low energy flat band in which the Coulomb interaction is large relative to the bandwidth, promoting correlated insulating states at half band filling, and superconducting (SC) phases with dome-like structure neighboring correlated insulating states. Here we show measurements of a dual-graphite-gated twisted bilayer graphene device, which minimizes charge inhomogeneity. We observe new correlated phases, including for the first time a SC pocket near half-filling of the electron-doped band and resistive states at quarter-filling of both bands that emerge in a magnetic field. Changing the layer polarization with vertical electric field reveals an unexpected competition between SC and correlated insulator phases, which we interpret to result from differences in disorder of each graphene layer and underscores the spatial inhomogeneity like twist angle as a significant source of disorder in these devices [1]. alternative_title: - Bulletin of the American Physical Society article_number: R14.00004 article_processing_charge: No author: - first_name: Shaowen full_name: Chen, Shaowen last_name: Chen - first_name: Matthew full_name: Yankowitz, Matthew last_name: Yankowitz - first_name: Hryhoriy full_name: Polshyn, Hryhoriy id: edfc7cb1-526e-11ec-b05a-e6ecc27e4e48 last_name: Polshyn orcid: 0000-0001-8223-8896 - first_name: Kenji full_name: Watanabe, Kenji last_name: Watanabe - first_name: Takashi full_name: Taniguchi, Takashi last_name: Taniguchi - first_name: David E. full_name: Graf, David E. last_name: Graf - first_name: Andrea full_name: Young, Andrea last_name: Young - first_name: Cory R. full_name: Dean, Cory R. last_name: Dean citation: ama: 'Chen S, Yankowitz M, Polshyn H, et al. Correlated insulating and superconducting phases in twisted bilayer graphene. In: APS March Meeting 2019. Vol 64. American Physical Society; 2019.' apa: 'Chen, S., Yankowitz, M., Polshyn, H., Watanabe, K., Taniguchi, T., Graf, D. E., … Dean, C. R. (2019). Correlated insulating and superconducting phases in twisted bilayer graphene. In APS March Meeting 2019 (Vol. 64). Boston, MA, United States: American Physical Society.' chicago: Chen, Shaowen, Matthew Yankowitz, Hryhoriy Polshyn, Kenji Watanabe, Takashi Taniguchi, David E. Graf, Andrea Young, and Cory R. Dean. “Correlated Insulating and Superconducting Phases in Twisted Bilayer Graphene.” In APS March Meeting 2019, Vol. 64. American Physical Society, 2019. ieee: S. Chen et al., “Correlated insulating and superconducting phases in twisted bilayer graphene,” in APS March Meeting 2019, Boston, MA, United States, 2019, vol. 64, no. 2. ista: 'Chen S, Yankowitz M, Polshyn H, Watanabe K, Taniguchi T, Graf DE, Young A, Dean CR. 2019. Correlated insulating and superconducting phases in twisted bilayer graphene. APS March Meeting 2019. APS: American Physical Society, Bulletin of the American Physical Society, vol. 64, R14.00004.' mla: Chen, Shaowen, et al. “Correlated Insulating and Superconducting Phases in Twisted Bilayer Graphene.” APS March Meeting 2019, vol. 64, no. 2, R14.00004, American Physical Society, 2019. short: S. Chen, M. Yankowitz, H. Polshyn, K. Watanabe, T. Taniguchi, D.E. Graf, A. Young, C.R. Dean, in:, APS March Meeting 2019, American Physical Society, 2019. conference: end_date: 2019-03-08 location: Boston, MA, United States name: 'APS: American Physical Society' start_date: 2019-03-04 date_created: 2022-02-04T13:48:04Z date_published: 2019-03-01T00:00:00Z date_updated: 2022-02-08T10:24:13Z day: '01' extern: '1' intvolume: ' 64' issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://meetings.aps.org/Meeting/MAR19/Session/R14.4 month: '03' oa: 1 oa_version: Published Version publication: APS March Meeting 2019 publication_identifier: issn: - 0003-0503 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: link: - relation: used_in_publication url: https://arxiv.org/abs/1808.07865 status: public title: Correlated insulating and superconducting phases in twisted bilayer graphene type: conference user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9 volume: 64 year: '2019' ... --- _id: '10723' abstract: - lang: eng text: In monolayer graphene, the interplay of electronic correlations with the internal spin- and valley- degrees of freedom leads to a complex phase diagram of isospin symmetry breaking at high magnetic fields. Recently, Wei et al. (Science (2018)) demonstrated that spin waves can be electrically generated and detected in graphene heterojunctions, allowing direct experiment access to the spin degree of freedom. Here, we apply this technique to high quality graphite-gated graphene devices showing robust fractional quantum Hall phases and isospin phase transitions. We use an edgeless Corbino geometry to eliminate the contributions of edge states to the spin-wave mediated nonlocal voltage, allowing unambiguous identification of spin wave transport signatures. Our data reveal two phases within the ν = 1 plateau. For exactly ν=1, charge is localized but spin waves propagate freely while small carrier doping completely quenches the low-energy spin-wave transport, even as those charges remain localized. We identify this new phase as a spin textured electron solid. We also find that spin-wave transport is modulated by phase transitions in the valley order that preserve spin polarization, suggesting that this technique is sensitive to both spin and valley order. article_number: P01.00004 article_processing_charge: No author: - first_name: Haoxin full_name: Zhou, Haoxin last_name: Zhou - first_name: Hryhoriy full_name: Polshyn, Hryhoriy id: edfc7cb1-526e-11ec-b05a-e6ecc27e4e48 last_name: Polshyn orcid: 0000-0001-8223-8896 - first_name: Takashi full_name: Tanaguchi, Takashi last_name: Tanaguchi - first_name: Kenji full_name: Watanabe, Kenji last_name: Watanabe - first_name: Andrea full_name: Young, Andrea last_name: Young citation: ama: 'Zhou H, Polshyn H, Tanaguchi T, Watanabe K, Young A. Spin wave transport through electron solids and fractional quantum Hall liquids in graphene. In: APS March Meeting 2019. Vol 64. American Physical Society; 2019.' apa: 'Zhou, H., Polshyn, H., Tanaguchi, T., Watanabe, K., & Young, A. (2019). Spin wave transport through electron solids and fractional quantum Hall liquids in graphene. In APS March Meeting 2019 (Vol. 64). Boston, MA, United States: American Physical Society.' chicago: Zhou, Haoxin, Hryhoriy Polshyn, Takashi Tanaguchi, Kenji Watanabe, and Andrea Young. “Spin Wave Transport through Electron Solids and Fractional Quantum Hall Liquids in Graphene.” In APS March Meeting 2019, Vol. 64. American Physical Society, 2019. ieee: H. Zhou, H. Polshyn, T. Tanaguchi, K. Watanabe, and A. Young, “Spin wave transport through electron solids and fractional quantum Hall liquids in graphene,” in APS March Meeting 2019, Boston, MA, United States, 2019, vol. 64, no. 2. ista: 'Zhou H, Polshyn H, Tanaguchi T, Watanabe K, Young A. 2019. Spin wave transport through electron solids and fractional quantum Hall liquids in graphene. APS March Meeting 2019. APS: American Physical Society vol. 64, P01.00004.' mla: Zhou, Haoxin, et al. “Spin Wave Transport through Electron Solids and Fractional Quantum Hall Liquids in Graphene.” APS March Meeting 2019, vol. 64, no. 2, P01.00004, American Physical Society, 2019. short: H. Zhou, H. Polshyn, T. Tanaguchi, K. Watanabe, A. Young, in:, APS March Meeting 2019, American Physical Society, 2019. conference: end_date: 2019-03-08 location: Boston, MA, United States name: 'APS: American Physical Society' start_date: 2019-03-04 date_created: 2022-02-04T12:14:02Z date_published: 2019-03-01T00:00:00Z date_updated: 2022-02-04T13:59:47Z day: '01' extern: '1' intvolume: ' 64' issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://meetings.aps.org/Meeting/MAR19/Session/P01.4 month: '03' oa: 1 oa_version: Published Version publication: APS March Meeting 2019 publication_identifier: issn: - 0003-0503 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Spin wave transport through electron solids and fractional quantum Hall liquids in graphene type: conference user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9 volume: 64 year: '2019' ...