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.
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Lerch, C., Vojta, T. Superfluid density and compressibility at the superfluid-Mott glass transition. Eur. Phys. J. Spec. Top. 227, 2275–2280 (2019). https://doi.org/10.1140/epjst/e2018-800002-2
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DOI: https://doi.org/10.1140/epjst/e2018-800002-2