Regular Article

Monte Carlo simulations of a disordered superconductor-metal quantum phase transition

Department of Physics, Missouri University of Science and Technology, Rolla, MO 65409, USA

^a e-mail: vojtat@mst.edu

Received: 9 August 2018
Received in final form: 17 October 2018
Published online: 10 December 2018

Abstract

We investigate the quantum phase transitions of a disordered nanowire from superconducting to metallic behavior by employing extensive Monte Carlo simulations. To this end, we map the quantum action onto a (1+1)-dimensional classical XY model with long-range interactions in imaginary time. We then analyze the finite-size scaling behavior of the order parameter susceptibility, the correlation time, the superfluid density, and the compressibility. We find strong numerical evidence for the critical behavior to be of infinite-randomness type and to belong to the random transverse-field Ising universality class, as predicted by a recent strong disorder renormalization group calculation.