Dynamical vortex phase diagram of 2D superconductivity in gated MoS2

TL;DR

This paper investigates the vortex dynamics and phase transitions in 2D superconducting MoS2, revealing a detailed phase diagram and evidence of vortex-antivortex states through transport measurements.

Contribution

It provides the first detailed dynamical phase diagram of vortex matter in gated MoS2, highlighting current-induced vortex states and the BKT transition.

Findings

Observation of BKT transition via current-voltage jump

Identification of multiple peaks indicating vortex states

Construction of a global vortex phase diagram

Abstract

Recent discoveries of two-dimensional (2D) superconductors have uncovered various new aspects of physical properties including vortex matter. In this paper, we report transport properties and a dynamical phase diagram at zero magnetic field in ion-gated MoS2. In addition to the universal jump in the current-voltage characteristic showing unambiguous evidence of the Berezinskii-Kosterlitz-Thouless (BKT) transition, we observed multiple peaks in the temperature- and current-derivative of the electrical resistance, based on which a dynamical phase diagram in the current-temperature plane was constructed. We found current-induced dynamical states of vortex-antivortex pairs, containing that with the phase slip line. Also, we present a global phase diagram of vortices in gated MoS2 which captures the nature of vortex matter of clean 2D superconductors.