Superfluidity vs Bose-Einstein condensation in a Bose gas with disorder

Details Superfluidity vs Bose-Einstein condensation in a Bose gas with disorder Superfluidity vs Bose-Einstein condensation in a Bose gas with disorder

2001-11-09

arxiv.org/abs/cond-mat/0111165v1

Physics

Condensed Matter

4 pages, 4 Postscript figures

Scientific paper

10.1103/PhysRevA.66.023603

We investigate the phenomenon of Bose-Einstein condensation and superfluidity in a Bose gas at zero temperature with disorder. By using the Diffusion Monte-Carlo method we calculate the superfluid and the condensate fraction of the system as a function of density and strength of disorder. In the regime of weak disorder we find agreement with the analytical results obtained within the Bogoliubov model. For strong disorder the system enters an unusual regime where the superfluid fraction is smaller than the condensate fraction.

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