Gate-induced superconductivity in a monolayer topological insulator

Sajadi, Ebrahim; Palomaki, Tauno; Fei, Zaiyao; Zhao, Wenjin; Bement, Philip; Olsen, Christian; Luescher, Silvia; Xu, Xiaodong; Folk, Joshua A.; Cobden, David H.

doi:10.1126/science.aar4426

Title: Gate-induced superconductivity in a monolayer topological insulator

Journal Article · 25 October 2018 · Science

DOI: https://doi.org/10.1126/science.aar4426 · OSTI ID:1483111

; Palomaki, Tauno; Fei, Zaiyao; Zhao, Wenjin;

; Olsen, Christian; Luescher, Silvia;

;

; Cobden, David H.

The layered semimetal tungsten ditelluride (WTe ₂ ) 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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Sponsoring Organization:: USDOE

OSTI ID:: 1483111

Journal Information:: Science, Journal Name: Science Journal Issue: 6417 Vol. 362; ISSN 0036-8075

Publisher:: American Association for the Advancement of Science (AAAS)Copyright Statement

Country of Publication:: United States

Language:: English

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