Monolayer Superconductivity in WS2.

Superconductivity in monolayer tungsten disulfide (2H-WS₂) is achieved by strong electrostatic electron doping of an electric double-layer transistor (EDLT). Single crystals of WS₂ are grown by a scalable method − chemical vapor deposition (CVD) on standard Si/SiO₂ substrate. The monolayers are identified by both AFM and color-coding techniques. The EDLT device based on single-layer WS₂ shows ambipolar transfer characteristics indicating a semiconducting nature of the material. Metallic transport on the electron side evolves into superconductivity with critical temperature T_c = 3.15 K. [ABSTRACT FROM AUTHOR]