Journal
NANO LETTERS
Volume 15, Issue 2, Pages 1197-1202Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl504314c
Keywords
WS2; transition metal dichalcogenides; ionic liquid gating; superconductivity; potential fluctuation; BKT transition
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Funding
- Swiss National Science Foundation
- EU Graphene Flagship
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We investigate transport through ionic liquid gated field effect transistors (FETs) based on exfoliated crystals of semiconducting WS2. Upon electron accumulation, at surface densities close to, or just larger than, 10(14) cm(2), transport exhibits metallic behavior with the surface resistivity decreasing pronouncedly upon cooling. A detailed characterization as a function of temperature and magnetic field clearly shows the occurrence of a gate-induced superconducting transition below a critical temperature Tc 4 K, a finding that represents the first demonstration of superconductivity in tungsten-based semiconducting transition metal dichalcogenides. We investigate the nature of superconductivity and find significant inhomogeneity, originating from the local detaching of the frozen ionic liquid from the WS2 surface. Despite the inhomogeneity, we find that in all cases where a fully developed zero resistance state is observed, different properties of the devices exhibit a behavior characteristic of a BerezinskiiKosterlitzThouless transition, as it could be expected in view of the two-dimensional nature of the electrostatically accumulated electron system
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