Superconductor-Insulator Transition in a Disordered Electronic System

TL;DR

This paper investigates the superconductor-insulator transition in a disordered 2D electronic system using Quantum Monte Carlo simulations, focusing on superfluid density and resistivity to identify the transition and its properties.

Contribution

It introduces a detailed numerical study of the superconductor-insulator transition in a disordered 2D system, highlighting the non-universality of the critical conductivity.

Findings

Superfluid density decreases with increasing disorder.

Insulating state characterized by temperature-dependent resistivity.

Critical dc conductivity appears non-universal.

Abstract

We study an electronic model of a 2D superconductor with onsite randomness using Quantum Monte Carlo simulations. The superfluid density is used to track the destruction of superconductivity in the ground state with increasing disorder. The non-superconducting state is identified as an insulator from the temperature dependence of its d.c. resistivity. The value of $\sigma_{\rm dc}$ at the superconductor-insulator transition appears to be non-universal.