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

2013/05/31 by Giuseppe Carleo, Guilhem Boéris, Markus Holzmann +1 · 1 citation
Physics and Astronomy · #cond-mat.quant-gas

paper · pdf · doi:10.1103/physrevlett.111.050406

published as Physical Review Letters 111 (2013) 050406

arxiv created 2013/08/28 · arxiv updated 2013/08/29

Abstract

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.

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• Quantum Impurities as Probes of Finite-Temperature Fluctuations in Two-Dimensional Bose Gases

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