Electrically tunable low-density superconductivity in a monolayer topological insulator

Valla Fatemi, Sanfeng Wu, Yuan Cao, Landry Bretheau, Quinn D. Gibson, Kenji Watanabe, Takashi Taniguchi, Robert J. Cava, Pablo Jarillo-Herrero

Research output: Contribution to journalArticle

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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 (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 temperatures Tc up to ∼1 kelvin. Our results establish monolayer WTe2 as a material platform for engineering nanodevices that combine superconducting and topological phases of matter.

Original languageEnglish (US)
Pages (from-to)926-929
Number of pages4
JournalScience
Volume362
Issue number6417
DOIs
StatePublished - Nov 23 2018

All Science Journal Classification (ASJC) codes

  • General

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    Fatemi, V., Wu, S., Cao, Y., Bretheau, L., Gibson, Q. D., Watanabe, K., Taniguchi, T., Cava, R. J., & Jarillo-Herrero, P. (2018). Electrically tunable low-density superconductivity in a monolayer topological insulator. Science, 362(6417), 926-929. https://doi.org/10.1126/science.aar4642