Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal
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1711.03584.pdf
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Author(s)
Wu, Sanfeng
Fatemi, Valla
Gibson, Quinn D.
Watanabe, Kenji
Taniguchi, Takashi
Cava, Robert J.
Jarillo-Herrero, Pablo
Date Issued
January 2018
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
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.
Version
Original manuscript
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1126/SCIENCE.AAN6003
