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

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 temperatures T c up to ~1 kelvin. Our results establish monolayer WTe 2 as a material platform for engineering nanodevices that combine superconducting and topological phases of matter.
Authors:
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Publication Date:
Grant/Contract Number:
SC0001088
Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science Journal Volume: 362 Journal Issue: 6417; Journal ID: ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
OSTI Identifier:
1483110

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., 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. 2018. "Electrically tunable low-density superconductivity in a monolayer topological insulator". United States. doi:10.1126/science.aar4642.
@article{osti_1483110,
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 (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 temperatures T c up to ~1 kelvin. Our results establish monolayer WTe 2 as a material platform for engineering nanodevices that combine superconducting and topological phases of matter.},
doi = {10.1126/science.aar4642},
journal = {Science},
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