Finite-Temperature Disordered Bosons in Two Dimensions

Journal article (2018)

Authors

G. Bertoli Université Paris-Saclay
V.P. Michal QCD/Vandersypen Lab
B. L. Altshuler Columbia University
G. V. Shlyapnikov Universiteit van Amsterdam, Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences, Université Paris-Saclay, CNRS, Skolkovo Institute of Science and Technology
Research Group
QCD/Vandersypen Lab
Copyright: © 2018 G. Bertoli, V.P. Michal, B. L. Altshuler, G. V. Shlyapnikov
DOI: https://doi.org/10.1103/PhysRevLett.121.030403
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Published Date

2018

Language

English

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Research Group

QCD/Vandersypen Lab

Abstract

We study phase transitions in a two dimensional weakly interacting Bose gas in a random potential at finite temperatures. We identify superfluid, normal fluid, and insulator phases and construct the phase diagram. At T=0 one has a tricritical point where the three phases coexist. The truncation of the energy distribution at the trap barrier, which is a generic phenomenon in cold atom systems, limits the growth of the localization length and in contrast to the thermodynamic limit the insulator phase is present at any temperature.

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