Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal
A variety of monolayer crystals have been proposed to be two-dimensional topological insulators exhibiting the quantum spin Hall effect (QSHE), possibly even at high temperatures. Here we report the observation of the QSHE in monolayer tungsten ditelluride (WTe2) at temperatures up to 100 kelvin. In...
| Main Authors: | , , , , , , |
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| Format: | Article |
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American Association for the Advancement of Science (AAAS)
2021
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| Online Access: | https://hdl.handle.net/1721.1/134925 |
| _version_ | 1811087884768247808 |
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| author | Wu, Sanfeng Fatemi, Valla Gibson, Quinn D Watanabe, Kenji Taniguchi, Takashi Cava, Robert J Jarillo-Herrero, Pablo |
| author_facet | Wu, Sanfeng Fatemi, Valla Gibson, Quinn D Watanabe, Kenji Taniguchi, Takashi Cava, Robert J Jarillo-Herrero, Pablo |
| author_sort | Wu, Sanfeng |
| collection | MIT |
| description | A variety of monolayer crystals have been proposed to be two-dimensional topological insulators exhibiting the quantum spin Hall effect (QSHE), possibly even at high temperatures. Here we report the observation of the QSHE in monolayer tungsten ditelluride (WTe2) at temperatures up to 100 kelvin. In the short-edge limit, the monolayer exhibits the hallmark transport conductance, ∼e2/h per edge, where e is the electron charge and h is Planck's constant. Moreover, a magnetic field suppresses the conductance, and the observed Zeeman-type gap indicates the existence of a Kramers degenerate point and the importance of time-reversal symmetry for protection from elastic backscattering. Our results establish the QSHE at temperatures much higher than in semiconductor heterostructures and allow for exploring topological phases in atomically thin crystals. |
| first_indexed | 2024-09-23T13:53:25Z |
| format | Article |
| id | mit-1721.1/134925 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T13:53:25Z |
| publishDate | 2021 |
| publisher | American Association for the Advancement of Science (AAAS) |
| record_format | dspace |
| spelling | mit-1721.1/1349252022-04-01T17:13:07Z Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal Wu, Sanfeng Fatemi, Valla Gibson, Quinn D Watanabe, Kenji Taniguchi, Takashi Cava, Robert J Jarillo-Herrero, Pablo A variety of monolayer crystals have been proposed to be two-dimensional topological insulators exhibiting the quantum spin Hall effect (QSHE), possibly even at high temperatures. Here we report the observation of the QSHE in monolayer tungsten ditelluride (WTe2) at temperatures up to 100 kelvin. In the short-edge limit, the monolayer exhibits the hallmark transport conductance, ∼e2/h per edge, where e is the electron charge and h is Planck's constant. Moreover, a magnetic field suppresses the conductance, and the observed Zeeman-type gap indicates the existence of a Kramers degenerate point and the importance of time-reversal symmetry for protection from elastic backscattering. Our results establish the QSHE at temperatures much higher than in semiconductor heterostructures and allow for exploring topological phases in atomically thin crystals. 2021-10-27T20:09:53Z 2021-10-27T20:09:53Z 2018 2019-03-27T14:17:18Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/134925 Wu, Sanfeng, Valla Fatemi, Quinn D. Gibson, Kenji Watanabe, Takashi Taniguchi, Robert J. Cava, and Pablo Jarillo-Herrero. “Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal.” Science 359, no. 6371 (January 4, 2018): 76–79. doi:10.1126/science.aan6003. http://dx.doi.org/10.1126/SCIENCE.AAN6003 Science Creative Commons Attribution-Noncommercial-Share Alike Attribution-NonCommercial-ShareAlike 4.0 International http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Association for the Advancement of Science (AAAS) arXiv |
| spellingShingle | Wu, Sanfeng Fatemi, Valla Gibson, Quinn D Watanabe, Kenji Taniguchi, Takashi Cava, Robert J Jarillo-Herrero, Pablo Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal |
| title | Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal |
| title_full | Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal |
| title_fullStr | Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal |
| title_full_unstemmed | Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal |
| title_short | Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal |
| title_sort | observation of the quantum spin hall effect up to 100 kelvin in a monolayer crystal |
| url | https://hdl.handle.net/1721.1/134925 |
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