Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal

Sanfeng Wu, Valla Fatemi, Quinn D. Gibson, Kenji Watanabe, Takashi Taniguchi, Robert J. Cava, Pablo Jarillo-Herrero

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207 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)76-79
Number of pages4
JournalScience
Volume359
Issue number6371
DOIs
StatePublished - Jan 5 2018

All Science Journal Classification (ASJC) codes

  • General

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    Wu, S., Fatemi, V., Gibson, Q. D., Watanabe, K., Taniguchi, T., Cava, R. J., & Jarillo-Herrero, P. (2018). Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal. Science, 359(6371), 76-79. https://doi.org/10.1126/science.aan6003