--- _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: '6369' abstract: - lang: eng text: We construct a metamaterial from radio-frequency harmonic oscillators, and find two topologically distinct phases resulting from dissipation engineered into the system. These phases are distinguished by a quantized value of bulk energy transport. The impulse response of our circuit is measured and used to reconstruct the band structure and winding number of circuit eigenfunctions around a dark mode. Our results demonstrate that dissipative topological transport can occur in a wider class of physical systems than considered before. article_number: '220301' author: - first_name: Eric I. full_name: Rosenthal, Eric I. last_name: Rosenthal - first_name: Nicole K. full_name: Ehrlich, Nicole K. last_name: Ehrlich - first_name: Mark S. full_name: Rudner, Mark S. last_name: Rudner - first_name: Andrew P full_name: Higginbotham, Andrew P id: 4AD6785A-F248-11E8-B48F-1D18A9856A87 last_name: Higginbotham orcid: 0000-0003-2607-2363 - first_name: K. W. full_name: Lehnert, K. W. last_name: Lehnert citation: ama: Rosenthal EI, Ehrlich NK, Rudner MS, Higginbotham AP, Lehnert KW. Topological phase transition measured in a dissipative metamaterial. Physical Review B. 2018;97(22). doi:10.1103/physrevb.97.220301 apa: Rosenthal, E. I., Ehrlich, N. K., Rudner, M. S., Higginbotham, A. P., & Lehnert, K. W. (2018). Topological phase transition measured in a dissipative metamaterial. Physical Review B. American Physical Society (APS). https://doi.org/10.1103/physrevb.97.220301 chicago: Rosenthal, Eric I., Nicole K. Ehrlich, Mark S. Rudner, Andrew P Higginbotham, and K. W. Lehnert. “Topological Phase Transition Measured in a Dissipative Metamaterial.” Physical Review B. American Physical Society (APS), 2018. https://doi.org/10.1103/physrevb.97.220301. ieee: E. I. Rosenthal, N. K. Ehrlich, M. S. Rudner, A. P. Higginbotham, and K. W. Lehnert, “Topological phase transition measured in a dissipative metamaterial,” Physical Review B, vol. 97, no. 22. American Physical Society (APS), 2018. ista: Rosenthal EI, Ehrlich NK, Rudner MS, Higginbotham AP, Lehnert KW. 2018. Topological phase transition measured in a dissipative metamaterial. Physical Review B. 97(22), 220301. mla: Rosenthal, Eric I., et al. “Topological Phase Transition Measured in a Dissipative Metamaterial.” Physical Review B, vol. 97, no. 22, 220301, American Physical Society (APS), 2018, doi:10.1103/physrevb.97.220301. short: E.I. Rosenthal, N.K. Ehrlich, M.S. Rudner, A.P. Higginbotham, K.W. Lehnert, Physical Review B 97 (2018). date_created: 2019-05-03T09:29:49Z date_published: 2018-06-04T00:00:00Z date_updated: 2021-01-12T08:07:16Z day: '04' doi: 10.1103/physrevb.97.220301 extern: '1' external_id: arxiv: - '1802.02243' intvolume: ' 97' issue: '22' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1802.02243 month: '06' oa: 1 oa_version: Preprint publication: Physical Review B publication_identifier: issn: - 2469-9950 - 2469-9969 publication_status: published publisher: American Physical Society (APS) quality_controlled: '1' status: public title: Topological phase transition measured in a dissipative metamaterial type: journal_article user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87 volume: 97 year: '2018' ... --- _id: '9065' abstract: - lang: eng text: Magnetic anisotropy in strontium iridate (Sr2IrO4) is found to be large because of the strong spin-orbit interactions. In our work, we studied the in-plane magnetic anisotropy of Sr2IrO4 and traced the anisotropic exchange interactions between the isospins in the crystal. The magnetic-field-dependent torque τ(H) showed a prominent transition from the canted antiferromagnetic state to the weak ferromagnetic (WFM) state. A comprehensive analysis was conducted to examine the isotropic and anisotropic regimes and probe the easy magnetization axis along the a b plane. The angle-dependent torque τ(θ) revealed a deviation from the sinusoidal behavior, and small differences in hysteresis were observed around 0° and 90° in the low-magnetic-field regime. This indicates that the orientation of the easy axis of the FM component is along the b axis, where the antiferromagnetic to WFM spin-flop transition occurs. We compared the coefficients of the magnetic susceptibility tensors and captured the anisotropy of the material. The in-plane τ(θ) revealed a tendency toward isotropic behavior for fields with values above the field value of the WFM transition. article_number: '155102' article_processing_charge: No article_type: original author: - first_name: Muhammad full_name: Nauman, Muhammad id: 32c21954-2022-11eb-9d5f-af9f93c24e71 last_name: Nauman orcid: 0000-0002-2111-4846 - first_name: Yunjeong full_name: Hong, Yunjeong last_name: Hong - first_name: Tayyaba full_name: Hussain, Tayyaba last_name: Hussain - first_name: M. S. full_name: Seo, M. S. last_name: Seo - first_name: S. Y. full_name: Park, S. Y. last_name: Park - first_name: N. full_name: Lee, N. last_name: Lee - first_name: Y. J. full_name: Choi, Y. J. last_name: Choi - first_name: Woun full_name: Kang, Woun last_name: Kang - first_name: Younjung full_name: Jo, Younjung last_name: Jo citation: ama: Nauman M, Hong Y, Hussain T, et al. In-plane magnetic anisotropy in strontium iridate Sr2IrO4. Physical Review B. 2017;96(15). doi:10.1103/physrevb.96.155102 apa: Nauman, M., Hong, Y., Hussain, T., Seo, M. S., Park, S. Y., Lee, N., … Jo, Y. (2017). In-plane magnetic anisotropy in strontium iridate Sr2IrO4. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.96.155102 chicago: Nauman, Muhammad, Yunjeong Hong, Tayyaba Hussain, M. S. Seo, S. Y. Park, N. Lee, Y. J. Choi, Woun Kang, and Younjung Jo. “In-Plane Magnetic Anisotropy in Strontium Iridate Sr2IrO4.” Physical Review B. American Physical Society, 2017. https://doi.org/10.1103/physrevb.96.155102. ieee: M. Nauman et al., “In-plane magnetic anisotropy in strontium iridate Sr2IrO4,” Physical Review B, vol. 96, no. 15. American Physical Society, 2017. ista: Nauman M, Hong Y, Hussain T, Seo MS, Park SY, Lee N, Choi YJ, Kang W, Jo Y. 2017. In-plane magnetic anisotropy in strontium iridate Sr2IrO4. Physical Review B. 96(15), 155102. mla: Nauman, Muhammad, et al. “In-Plane Magnetic Anisotropy in Strontium Iridate Sr2IrO4.” Physical Review B, vol. 96, no. 15, 155102, American Physical Society, 2017, doi:10.1103/physrevb.96.155102. short: M. Nauman, Y. Hong, T. Hussain, M.S. Seo, S.Y. Park, N. Lee, Y.J. Choi, W. Kang, Y. Jo, Physical Review B 96 (2017). date_created: 2021-02-02T15:49:21Z date_published: 2017-10-01T00:00:00Z date_updated: 2021-02-03T12:53:00Z day: '01' doi: 10.1103/physrevb.96.155102 extern: '1' intvolume: ' 96' issue: '15' language: - iso: eng month: '10' oa_version: None publication: Physical Review B publication_identifier: issn: - 2469-9950 - 2469-9969 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: In-plane magnetic anisotropy in strontium iridate Sr2IrO4 type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 96 year: '2017' ...