Charge Density Wave and Superconductivity in Transition Metal Dichalcogenides

TL;DR

This paper explores the interplay between charge density waves and superconductivity in transition metal dichalcogenides, revealing that non-magnetic disorder can unexpectedly restore superconductivity suppressed by charge density waves.

Contribution

It demonstrates, through advanced theoretical calculations, that non-magnetic disorder fluctuations can revive superconductivity in materials where it is typically suppressed by charge density waves.

Findings

Superconductivity reappears with disorder fluctuations.

Charge density wave suppresses superconductivity.

Disorder-induced superconductivity observed experimentally.

Abstract

Competing orders in condensed matter give rise to the emergence of fascinating, new phenomena. Here, we investigate the competition between superconductivity and charge density wave in the context of layered-metallic compounds, transition metal dichalcogenides, in which the superconducting state is usually suppressed by the charge density wave. We show, using real-space self-consistent Bogoliubov-de Gennes calculations and momentum-space calculations involving density-functional theory and dynamical mean-field theory, that there is a surprising reappearance of superconductivity in the presence of non-magnetic disorder fluctuations, as observed in recent experiments.