Gate-induced superconductivity in a monolayer topological insulator.
basic_science · Level V
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- Record sourced from PubMed, PMID 30361385.
- Also identified by DOI 10.1126/science.aar4426.
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Abstract
The layered semimetal tungsten ditelluride (WTe<sub>2</sub>) 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.