1305.3032 (Giuseppe Carleo et al.)

Universal Superfluid Transition and Transport Properties of
Two-Dimensional Dirty Bosons    [PDF]

Giuseppe Carleo, Guilhem Boéris, Markus Holzmann, Laurent Sanchez-Palencia

We study the phase diagram of two-dimensional, interacting bosons in the presence of a correlated disorder in continuous space, using large-scale finite temperature quantum Monte Carlo simulations. We show that the superfluid transition is strongly protected against disorder. It remains of the Berezinskii-Kosterlitz-Thouless type up to disorder strengths comparable to the chemical potential. Moreover, we study the transport properties in the strong disorder regime where a zero-temperature Bose-glass phase is expected. We show that the conductance exhibits a thermally activated behavior vanishing only at zero temperature. Our results point towards the existence of Bose bad-metal phase as a precursor of the Bose-glass phase.

View original: http://arxiv.org/abs/1305.3032