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arXiv · 1708.03628

Finite temperature disordered bosons in two dimensions

G. Bertoli·V. P. Michal·B. L. Altshuler·G. V. Shlyapnikov
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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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G. Bertoli, V. P. Michal, B. L. Altshuler, G. V. Shlyapnikov. 2018-07-25. Finite temperature disordered bosons in two dimensions. https://doi.org/10.1103/physrevlett.121.030403

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