Superfluidity vs Bose-Einstein condensation in a Bose gas with disorder
Condensed Matter
2009-11-07 v1
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0111165,
title = {Superfluidity vs Bose-Einstein condensation in a Bose gas with disorder},
author = {G. E. Astrakharchik and J. Boronat and J. Casulleras and S. Giorgini},
journal= {arXiv preprint arXiv:cond-mat/0111165},
year = {2009}
}
Comments
4 pages, 4 Postscript figures