Cooperative orbital moments and edge magnetoresistance in monolayer WTe2
We argue that edge electrons in monolayer WTe2 can possess a “cooperative” orbital moment (COM) that critically impacts its edge magnetoresistance behavior. Arising from the cooperative action of both Rashba and Ising spin orbit coupling, COM quickly achieves large magnitudes (of order few Bohr magn...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Online Access: | https://hdl.handle.net/10356/147879 |
| _version_ | 1826116794782318592 |
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| author | Arora, Arpit Shi, Li-kun Song, Justin Chien Wen |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Arora, Arpit Shi, Li-kun Song, Justin Chien Wen |
| author_sort | Arora, Arpit |
| collection | NTU |
| description | We argue that edge electrons in monolayer WTe2 can possess a “cooperative” orbital moment (COM) that critically impacts its edge magnetoresistance behavior. Arising from the cooperative action of both Rashba and Ising spin orbit coupling, COM quickly achieves large magnitudes (of order few Bohr magnetons) even for relatively small spin-orbit coupling strengths. As we explain, such large COM magnitudes arise from an unconventional cooperative spin canting of edge spins when Rashba and Ising spin orbit coupling act together. Strikingly, COM can compete with spin moments to produce an unusual anisotropic edge magnetoresistance oriented at an oblique angle. In particular, this competition produces a direction along which B is ineffective at gapping out the edge spectrum leaving it nearly gapless. As a result, large contrasts in gap sizes manifest as B is rotated granting giant anisotropic magnetoresistance of 0.1 − 10 million % at 10 T and low temperature. |
| first_indexed | 2024-10-01T04:17:16Z |
| format | Journal Article |
| id | ntu-10356/147879 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:17:16Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1478792023-02-28T20:10:25Z Cooperative orbital moments and edge magnetoresistance in monolayer WTe2 Arora, Arpit Shi, Li-kun Song, Justin Chien Wen School of Physical and Mathematical Sciences Science::Physics Topological Insulators Magnetoresistance We argue that edge electrons in monolayer WTe2 can possess a “cooperative” orbital moment (COM) that critically impacts its edge magnetoresistance behavior. Arising from the cooperative action of both Rashba and Ising spin orbit coupling, COM quickly achieves large magnitudes (of order few Bohr magnetons) even for relatively small spin-orbit coupling strengths. As we explain, such large COM magnitudes arise from an unconventional cooperative spin canting of edge spins when Rashba and Ising spin orbit coupling act together. Strikingly, COM can compete with spin moments to produce an unusual anisotropic edge magnetoresistance oriented at an oblique angle. In particular, this competition produces a direction along which B is ineffective at gapping out the edge spectrum leaving it nearly gapless. As a result, large contrasts in gap sizes manifest as B is rotated granting giant anisotropic magnetoresistance of 0.1 − 10 million % at 10 T and low temperature. Ministry of Education (MOE) Nanyang Technological University National Research Foundation (NRF) This work was supported by the Singapore National Research Foundation (NRF) under NRF fellowship award NRF-NRFF2016-05, a Nanyang Technological University start-up grant (NTU-SUG), and Singapore MOE Academic Research Fund Tier 3 Grant MOE2018-T3-1-002. 2021-04-20T06:41:09Z 2021-04-20T06:41:09Z 2020 Journal Article Arora, A., Shi, L. & Song, J. C. W. (2020). Cooperative orbital moments and edge magnetoresistance in monolayer WTe2. Physical Review B, 102. https://dx.doi.org/10.1103/PhysRevB.102.161402 2469-9950 https://hdl.handle.net/10356/147879 10.1103/PhysRevB.102.161402 102 en Physical Review B 10.21979/N9/DKLSGJ © 2020 American Physical Society (APS). All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society (APS). application/pdf |
| spellingShingle | Science::Physics Topological Insulators Magnetoresistance Arora, Arpit Shi, Li-kun Song, Justin Chien Wen Cooperative orbital moments and edge magnetoresistance in monolayer WTe2 |
| title | Cooperative orbital moments and edge magnetoresistance in monolayer WTe2 |
| title_full | Cooperative orbital moments and edge magnetoresistance in monolayer WTe2 |
| title_fullStr | Cooperative orbital moments and edge magnetoresistance in monolayer WTe2 |
| title_full_unstemmed | Cooperative orbital moments and edge magnetoresistance in monolayer WTe2 |
| title_short | Cooperative orbital moments and edge magnetoresistance in monolayer WTe2 |
| title_sort | cooperative orbital moments and edge magnetoresistance in monolayer wte2 |
| topic | Science::Physics Topological Insulators Magnetoresistance |
| url | https://hdl.handle.net/10356/147879 |
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