Regular Article

Charge density wave and superconductivity in transition metal dichalcogenides^★

¹ Department of Physics, North Eastern Hill University, Shillong, Meghalaya 793022, India
² Department of Physics, Indian Institute of Technology Kharagpur, W.B. 721302, Kharagpur, India
³ Department of Physics and Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, W.B. 721302, Kharagpur, India

^a Present address: Department of Physics, Amity Institute of Applied Sciences, Amity University, Kolkata, W.B. 700135, India.
^b e-mail: sudiptakoley20@gmail.com
^c Present address: Material Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.

Received: 25 October 2019
Received in final form: 28 February 2020
Published online: 4 May 2020

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.