Superfluid density and compressibility at the superfluid-Mott glass transition
Department of Physics, Missouri University of Science and Technology, Rolla, MO 65409, USA
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Published online: 24 January 2019
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.
© EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature, 2019