Symmetry, spin-texture, and tunable quantum geometry in a WTe2 monolayer
The spin orientation of electronic wave functions in crystals is an internal degree of freedom, typically insensitive to electrical knobs. We argue from a general symmetry analysis and a k⋅p perspective, that monolayer 1T′−WTe2 possesses a gate-activated canted spin texture that produces an electric...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
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| Online Access: | https://hdl.handle.net/10356/102628 http://hdl.handle.net/10220/47781 |
| _version_ | 1811686562846474240 |
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| author | Shi, Li-kun Song, Justin Chien Wen |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Shi, Li-kun Song, Justin Chien Wen |
| author_sort | Shi, Li-kun |
| collection | NTU |
| description | The spin orientation of electronic wave functions in crystals is an internal degree of freedom, typically insensitive to electrical knobs. We argue from a general symmetry analysis and a k⋅p perspective, that monolayer 1T′−WTe2 possesses a gate-activated canted spin texture that produces an electrically tunable bulk band quantum geometry. In particular, we find that due to its out-of-plane asymmetry, an applied out-of-plane electric field breaks inversion symmetry to induce both in-plane and out-of-plane electric dipoles. These in-turn generate spin-orbit coupling to lift the spin degeneracy and enable a bulk band Berry curvature and magnetic moment distribution to develop. Further, due to its low symmetry, Berry curvature and magnetic moment in 1T′−WTe2 possess a dipolar distribution in momentum space, and can lead to unconventional effects such as a current induced magnetization and quantum nonlinear anomalous Hall effect. These render 1T′−WTe2 a rich two-dimensional platform for all-electrical control over quantum geometric effects. |
| first_indexed | 2024-10-01T05:02:24Z |
| format | Journal Article |
| id | ntu-10356/102628 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:02:24Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/1026282023-02-28T20:09:36Z Symmetry, spin-texture, and tunable quantum geometry in a WTe2 monolayer Shi, Li-kun Song, Justin Chien Wen School of Physical and Mathematical Sciences DRNTU::Science::Physics Geometric & Topological Phases Magnetoelectric Effect The spin orientation of electronic wave functions in crystals is an internal degree of freedom, typically insensitive to electrical knobs. We argue from a general symmetry analysis and a k⋅p perspective, that monolayer 1T′−WTe2 possesses a gate-activated canted spin texture that produces an electrically tunable bulk band quantum geometry. In particular, we find that due to its out-of-plane asymmetry, an applied out-of-plane electric field breaks inversion symmetry to induce both in-plane and out-of-plane electric dipoles. These in-turn generate spin-orbit coupling to lift the spin degeneracy and enable a bulk band Berry curvature and magnetic moment distribution to develop. Further, due to its low symmetry, Berry curvature and magnetic moment in 1T′−WTe2 possess a dipolar distribution in momentum space, and can lead to unconventional effects such as a current induced magnetization and quantum nonlinear anomalous Hall effect. These render 1T′−WTe2 a rich two-dimensional platform for all-electrical control over quantum geometric effects. Published version 2019-03-06T05:22:01Z 2019-12-06T20:57:52Z 2019-03-06T05:22:01Z 2019-12-06T20:57:52Z 2019 Journal Article Shi, L.-K., & Song, J. C. W. (2019). Symmetry, spin-texture, and tunable quantum geometry in a WTe2 monolayer. Physical Review B, 99(3), 035403-. doi:10.1103/PhysRevB.99.035403 2469-9950 https://hdl.handle.net/10356/102628 http://hdl.handle.net/10220/47781 10.1103/PhysRevB.99.035403 en Physical Review B 10.21979/N9/SPUNGY © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society. 10 p. application/pdf |
| spellingShingle | DRNTU::Science::Physics Geometric & Topological Phases Magnetoelectric Effect Shi, Li-kun Song, Justin Chien Wen Symmetry, spin-texture, and tunable quantum geometry in a WTe2 monolayer |
| title | Symmetry, spin-texture, and tunable quantum geometry in a WTe2 monolayer |
| title_full | Symmetry, spin-texture, and tunable quantum geometry in a WTe2 monolayer |
| title_fullStr | Symmetry, spin-texture, and tunable quantum geometry in a WTe2 monolayer |
| title_full_unstemmed | Symmetry, spin-texture, and tunable quantum geometry in a WTe2 monolayer |
| title_short | Symmetry, spin-texture, and tunable quantum geometry in a WTe2 monolayer |
| title_sort | symmetry spin texture and tunable quantum geometry in a wte2 monolayer |
| topic | DRNTU::Science::Physics Geometric & Topological Phases Magnetoelectric Effect |
| url | https://hdl.handle.net/10356/102628 http://hdl.handle.net/10220/47781 |
| work_keys_str_mv | AT shilikun symmetryspintextureandtunablequantumgeometryinawte2monolayer AT songjustinchienwen symmetryspintextureandtunablequantumgeometryinawte2monolayer |