Superfluid Density and Compressibility at the Superfluid-Mott Glass Transition
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.
C. Lerch and T. Vojta, "Superfluid Density and Compressibility at the Superfluid-Mott Glass Transition," European Physical Journal: Special Topics, vol. 227, no. 15-16, pp. 2275-2280, Springer Verlag, Mar 2019.
The definitive version is available at https://doi.org/10.1140/epjst/e2018-800002-2
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01 Mar 2019