title: Superconducting dome in a gate-tuned band insulator.
abstract: A dome-shaped superconducting region appears in the phase diagrams of many unconventional superconductors. In doped band insulators, however, reaching optimal superconductivity by the fine-tuning of carriers has seldom been seen. We report the observation of a superconducting dome in the temperature-carrier density phase diagram of MoS(2), an archetypal band insulator. By quasi-continuous electrostatic carrier doping achieved through a combination of liquid and solid gating, we revealed a large enhancement in the transition temperature T(c) occurring at optimal doping in the chemically inaccessible low-carrier density regime. This observation indicates that the superconducting dome may arise even in doped band insulators.
authors.affiliation: Quantum-Phase Electronics Center and Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. yejianting@ap.t.u-tokyo.ac.jp
authors.forename: J T
authors.initials: JT
authors.lastname: Ye
authors.forename: Y J
authors.initials: YJ
authors.lastname: Zhang
authors.forename: R
authors.initials: R
authors.lastname: Akashi
authors.forename: M S
authors.initials: MS
authors.lastname: Bahramy
authors.forename: R
authors.initials: R
authors.lastname: Arita
authors.forename: Y
authors.initials: Y
authors.lastname: Iwasa