2D superconductivity and vortex dynamics in 1T-MoS2

Abstract

The Berezinskii-Kosterlitz-Thouless phase transition and Bose metal phase, driven by vortices and their dynamics are the hallmark features of a clean two-dimensional superconductor. Materials with a minimal structural disorder and high conductivity are essential for the observation of these features. 1T-MoS2, a relatively unexplored metallic van der Waals material, is a promising candidate in this regard. Here, we report the observation of two-dimensional superconductivity in a few-layer 1T-MoS2 device. The electrical characterisation reveals a transition temperature Tc ~920 mK. Berezinskii-Kosterlitz-Thouless transition and anisotropy in the magneto-transport confirm the dimensionality of the superconductivity. In addition, we observe an enhancement in the parallel upper-critical-field and emergence of the Bose metal state in our sample. The observation of 2D superconductivity in 1T-MoS2 and the capability to scalably engineer this phase on the semiconducting 2H-MoS2 phase opens up a new route for the realisation and study of monolithic hybrid quantum circuits.