Onset of two-dimensional superconductivity in space charge doped few-layer molybdenum disulfide

Johan Biscaras, Zhesheng Chen, Andrea Paradisi and Abhay Shukla ()
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Johan Biscaras: Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Universités—UPMC Univ. Paris 06, UMR CNRS 7590, Muséum National d'Histoire Naturelle
Zhesheng Chen: Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Universités—UPMC Univ. Paris 06, UMR CNRS 7590, Muséum National d'Histoire Naturelle
Andrea Paradisi: Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Universités—UPMC Univ. Paris 06, UMR CNRS 7590, Muséum National d'Histoire Naturelle
Abhay Shukla: Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Universités—UPMC Univ. Paris 06, UMR CNRS 7590, Muséum National d'Histoire Naturelle

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Atomically thin films of layered materials such as molybdenum disulfide (MoS2) are of growing interest for the study of phase transitions in two-dimensions through electrostatic doping. Electrostatic doping techniques giving access to high carrier densities are needed to achieve such phase transitions. Here we develop a method of electrostatic doping which allows us to reach a maximum n-doping density of 4 × 1014 cm−2 in few-layer MoS2 on glass substrates. With increasing carrier density we first induce an insulator to metal transition and subsequently an incomplete metal to superconductor transition in MoS2 with critical temperature ≈10 K. Contrary to earlier reports, after the onset of superconductivity, the superconducting transition temperature does not depend on the carrier density. Our doping method and the results we obtain in MoS2 for samples as thin as bilayers indicates the potential of this approach.

Date: 2015
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DOI: 10.1038/ncomms9826

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