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Wu, Sanfeng; Fatemi, Valla; Gibson, Quinn D; Watanabe, Kenji; Taniguchi, Takashi; Cava, Robert J; Jarillo-Herrero, Pablo
Science (American Association for the Advancement of Science), 01/2018, Letnik: 359, Številka: 6371Journal Article
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 (WTe ) at temperatures up to 100 kelvin. In the short-edge limit, the monolayer exhibits the hallmark transport conductance, ~ / per edge, where is the electron charge and 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.
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