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

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 (WTe 2 ) at temperatures up to 100 kelvin. In the short-edge limit, the monolayer exhibits the hallmark transport conductance, ~ e 2 / 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.

Authors:
ORCiD logo; ORCiD logo; ; ORCiD logo; ; ; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1435487
Grant/Contract Number:  
SC0001088
Resource Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science Journal Volume: 359 Journal Issue: 6371; Journal ID: ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English

Citation Formats

Wu, Sanfeng, Fatemi, Valla, Gibson, Quinn D., Watanabe, Kenji, Taniguchi, Takashi, Cava, Robert J., and Jarillo-Herrero, Pablo. Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal. United States: N. p., 2018. Web. doi:10.1126/science.aan6003.
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. United States. doi:10.1126/science.aan6003.
Wu, Sanfeng, Fatemi, Valla, Gibson, Quinn D., Watanabe, Kenji, Taniguchi, Takashi, Cava, Robert J., and Jarillo-Herrero, Pablo. Thu . "Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal". United States. doi:10.1126/science.aan6003.
@article{osti_1435487,
title = {Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal},
author = {Wu, Sanfeng and Fatemi, Valla and Gibson, Quinn D. and Watanabe, Kenji and Taniguchi, Takashi and Cava, Robert J. and Jarillo-Herrero, Pablo},
abstractNote = {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 2 ) at temperatures up to 100 kelvin. In the short-edge limit, the monolayer exhibits the hallmark transport conductance, ~ e 2 / 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.},
doi = {10.1126/science.aan6003},
journal = {Science},
number = 6371,
volume = 359,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1126/science.aan6003

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Cited by: 107 works
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Works referenced in this record:

Quantum Spin Hall Insulator State in HgTe Quantum Wells
journal, November 2007


Colloquium: Topological insulators
journal, November 2010