We report the observation of electric-field-induced superconductivity on the surface of bulk polycrystalline MoS2 using electric double-layer doping. A gate voltage applied in an ionic liquid environment systematically increased carrier density, leading to an insulator-to-metal transition and a sharp resistance drop at low temperatures, indicating superconductivity. The onset temperature of superconductivity strongly depended on carrier density inferred from conductance, showing a significant increase and eventual saturation. Unlike prior studies limited to single-crystalline MoS2, our results demonstrate that superconductivity can also be electrostatically induced in polycrystalline systems, broadening the scope for exploring gate-controlled superconductivity in a wider range of materials.
@article{arxiv.2509.03031,
title = {Observation of surface superconductivity in bulk polycrystalline MoS2 induced by electric double-layer doping},
author = {Yoshihiro Shimazu and Tomonori Miyatake and Kento Ueno and Masatomo Uehara},
journal= {arXiv preprint arXiv:2509.03031},
year = {2025}
}