title: Universal superfluid transition and transport properties of two-dimensional dirty bosons.
abstract: We study the phase diagram of two-dimensional, interacting bosons in the presence of a correlated disorder in continuous space, by using large-scale quantum Monte Carlo simulations at finite temperature. 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 a Bose bad-metal phase as a precursor of the Bose-glass phase.
authors: Laboratoire Charles Fabry, Institut d'Optique, CNRS, Univ Paris Sud 11, 2 avenue Augustin Fresnel, F-91127 Palaiseau cedex, France.
authors: Giuseppe
authors: G
authors: Carleo
authors: Guilhem
authors: G
authors: Boéris
authors: Markus
authors: M
authors: Holzmann
authors: Laurent
authors: L
authors: Sanchez-Palencia