---
_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'
...