Gate-induced superconductivity in a monolayer topological insulator

The layered semimetal tungsten ditelluride (WTe ) has recently been found to be a two-dimensional topological insulator (2D TI) when thinned down to a single monolayer, with conducting helical edge channels. We found that intrinsic superconductivity can be induced in this monolayer 2D TI by mild ele...

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Published inScience (American Association for the Advancement of Science) Vol. 362; no. 6417; pp. 922 - 925
Main Authors Sajadi, Ebrahim, Palomaki, Tauno, Fei, Zaiyao, Zhao, Wenjin, Bement, Philip, Olsen, Christian, Luescher, Silvia, Xu, Xiaodong, Folk, Joshua A, Cobden, David H
Format Journal Article
LanguageEnglish
Published United States The American Association for the Advancement of Science 23.11.2018
American Association for the Advancement of Science (AAAS)
Subjects
Carrier density
Channel gating
Electric potential
Fabrication
Monolayers
Quantum phenomena
Superconductivity
Superconductors
Tungsten
Voltage
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Summary:The layered semimetal tungsten ditelluride (WTe ) has recently been found to be a two-dimensional topological insulator (2D TI) when thinned down to a single monolayer, with conducting helical edge channels. We found that intrinsic superconductivity can be induced in this monolayer 2D TI by mild electrostatic doping at temperatures below 1 kelvin. The 2D TI-superconductor transition can be driven by applying a small gate voltage. This discovery offers possibilities for gate-controlled devices combining superconductivity and nontrivial topological properties, and could provide a basis for quantum information schemes based on topological protection.
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USDOE
ISSN:0036-8075
1095-9203
DOI:10.1126/science.aar4426