---
_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
arxiv: 1
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. <i>Physical
    Review B</i>. 2022;105. doi:<a href="https://doi.org/10.1103/PhysRevB.105.L121407">10.1103/PhysRevB.105.L121407</a>
  apa: Davydova, M., Serbyn, M., &#38; Ishizuka, H. (2022). Symmetry-allowed nonlinear
    orbital response across the topological phase transition in centrosymmetric materials.
    <i>Physical Review B</i>. American Physical Society. <a href="https://doi.org/10.1103/PhysRevB.105.L121407">https://doi.org/10.1103/PhysRevB.105.L121407</a>
  chicago: Davydova, Margarita, Maksym Serbyn, and Hiroaki Ishizuka. “Symmetry-Allowed
    Nonlinear Orbital Response across the Topological Phase Transition in Centrosymmetric
    Materials.” <i>Physical Review B</i>. American Physical Society, 2022. <a href="https://doi.org/10.1103/PhysRevB.105.L121407">https://doi.org/10.1103/PhysRevB.105.L121407</a>.
  ieee: M. Davydova, M. Serbyn, and H. Ishizuka, “Symmetry-allowed nonlinear orbital
    response across the topological phase transition in centrosymmetric materials,”
    <i>Physical Review B</i>, 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.” <i>Physical Review
    B</i>, vol. 105, L121407, American Physical Society, 2022, doi:<a href="https://doi.org/10.1103/PhysRevB.105.L121407">10.1103/PhysRevB.105.L121407</a>.
  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'
arxiv: 1
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. <i>Physical Review B</i>.
    2018;97(22). doi:<a href="https://doi.org/10.1103/physrevb.97.220301">10.1103/physrevb.97.220301</a>
  apa: Rosenthal, E. I., Ehrlich, N. K., Rudner, M. S., Higginbotham, A. P., &#38;
    Lehnert, K. W. (2018). Topological phase transition measured in a dissipative
    metamaterial. <i>Physical Review B</i>. American Physical Society (APS). <a href="https://doi.org/10.1103/physrevb.97.220301">https://doi.org/10.1103/physrevb.97.220301</a>
  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.”
    <i>Physical Review B</i>. American Physical Society (APS), 2018. <a href="https://doi.org/10.1103/physrevb.97.220301">https://doi.org/10.1103/physrevb.97.220301</a>.
  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,”
    <i>Physical Review B</i>, 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.” <i>Physical Review B</i>, vol. 97, no. 22, 220301, American Physical
    Society (APS), 2018, doi:<a href="https://doi.org/10.1103/physrevb.97.220301">10.1103/physrevb.97.220301</a>.
  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. <i>Physical Review B</i>. 2017;96(15). doi:<a href="https://doi.org/10.1103/physrevb.96.155102">10.1103/physrevb.96.155102</a>
  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. <i>Physical
    Review B</i>. American Physical Society. <a href="https://doi.org/10.1103/physrevb.96.155102">https://doi.org/10.1103/physrevb.96.155102</a>
  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.” <i>Physical Review B</i>. American Physical Society,
    2017. <a href="https://doi.org/10.1103/physrevb.96.155102">https://doi.org/10.1103/physrevb.96.155102</a>.
  ieee: M. Nauman <i>et al.</i>, “In-plane magnetic anisotropy in strontium iridate
    Sr2IrO4,” <i>Physical Review B</i>, 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.” <i>Physical Review B</i>, vol. 96, no. 15, 155102, American Physical
    Society, 2017, doi:<a href="https://doi.org/10.1103/physrevb.96.155102">10.1103/physrevb.96.155102</a>.
  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'
...