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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/hper edge, whereeis the electron charge andhis 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:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1541687
DOE Contract Number:  
SC0001088
Resource Type:
Journal Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 359; Journal Issue: 6371; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
Science & Technology - Other Topics

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_1541687,
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 (WTe2) at temperatures up to 100 kelvin. In the short-edge limit, the monolayer exhibits the hallmark transport conductance, ~e2/hper edge, whereeis the electron charge andhis 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},
issn = {0036-8075},
number = 6371,
volume = 359,
place = {United States},
year = {2018},
month = {1}
}

Works referenced in this record:

Colloquium: Topological insulators
journal, November 2010


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