Eur. Phys. J. Special Topics 227, 2275–2280 (2019)
https://doi.org/10.1140/epjst/e2018-800002-2

Regular Article

Superfluid density and compressibility at the superfluid-Mott glass transition

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

^a e-mail: vojtat@mst.edu

Received: 3 January 2018
Published online: 24 January 2019

Abstract

Systems of disordered interacting bosons with particle-hole symmetry can undergo a quantum phase transition between the superfluid phase and the Mott glass phase which is a gapless incompressible insulator. We employ large-scale Monte Carlo simulations of a two-dimensional site-diluted quantum rotor model to investigate the properties of the superfluid density and the compressibility at this transition. We find that both quantities feature power-law critical behavior with exponents governed by generalized Josephson relations.