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Title: Electrically tunable low-density superconductivity in a monolayer topological insulator

Abstract

Turning on superconductivity in a topologically nontrivial insulator may provide a route to search for non-Abelian topological states. However, existing demonstrations of superconductor-insulator switches have involved only topologically trivial systems. Here we report reversible, in situ electrostatic on-off switching of superconductivity in the recently established quantum spin Hall insulator monolayer tungsten ditelluride (WTe 2). Fabricated into a van der Waals field-effect transistor, the monolayer’s ground state can be continuously gate-tuned from the topological insulating to the superconducting state, with critical temperaturesT cup to ~1 kelvin. Our results establish monolayer WTe 2as a material platform for engineering nanodevices that combine superconducting and topological phases of matter.

Authors:
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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), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566717
DOE Contract Number:  
SC0001088
Resource Type:
Journal Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 362; Journal Issue: 6417; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
solar (photovoltaic), solid state lighting, photosynthesis (natural and artificial), charge transport, optics, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing)

Citation Formats

Fatemi, Valla, Wu, Sanfeng, Cao, Yuan, Bretheau, Landry, Gibson, Quinn D., Watanabe, Kenji, Taniguchi, Takashi, Cava, Robert J., and Jarillo-Herrero, Pablo. Electrically tunable low-density superconductivity in a monolayer topological insulator. United States: N. p., 2018. Web. doi:10.1126/science.aar4642.
Fatemi, Valla, Wu, Sanfeng, Cao, Yuan, Bretheau, Landry, Gibson, Quinn D., Watanabe, Kenji, Taniguchi, Takashi, Cava, Robert J., & Jarillo-Herrero, Pablo. Electrically tunable low-density superconductivity in a monolayer topological insulator. United States. doi:10.1126/science.aar4642.
Fatemi, Valla, Wu, Sanfeng, Cao, Yuan, Bretheau, Landry, Gibson, Quinn D., Watanabe, Kenji, Taniguchi, Takashi, Cava, Robert J., and Jarillo-Herrero, Pablo. Thu . "Electrically tunable low-density superconductivity in a monolayer topological insulator". United States. doi:10.1126/science.aar4642.
@article{osti_1566717,
title = {Electrically tunable low-density superconductivity in a monolayer topological insulator},
author = {Fatemi, Valla and Wu, Sanfeng and Cao, Yuan and Bretheau, Landry and Gibson, Quinn D. and Watanabe, Kenji and Taniguchi, Takashi and Cava, Robert J. and Jarillo-Herrero, Pablo},
abstractNote = {Turning on superconductivity in a topologically nontrivial insulator may provide a route to search for non-Abelian topological states. However, existing demonstrations of superconductor-insulator switches have involved only topologically trivial systems. Here we report reversible, in situ electrostatic on-off switching of superconductivity in the recently established quantum spin Hall insulator monolayer tungsten ditelluride (WTe2). Fabricated into a van der Waals field-effect transistor, the monolayer’s ground state can be continuously gate-tuned from the topological insulating to the superconducting state, with critical temperaturesTcup to ~1 kelvin. Our results establish monolayer WTe2as a material platform for engineering nanodevices that combine superconducting and topological phases of matter.},
doi = {10.1126/science.aar4642},
journal = {Science},
issn = {0036-8075},
number = 6417,
volume = 362,
place = {United States},
year = {2018},
month = {10}
}

Works referenced in this record:

Colloquium: Topological insulators
journal, November 2010


The influence of fluctuation pairing of electrons on the conductivity of normal metal
journal, February 1968