Superfluid behavior of a Bose-Einstein condensate in a random potential

Superfluid behavior of a Bose-Einstein condensate in a random potential

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Jakob Yngvason, University of Vienna
Jadwin Hall 343

We investigate the relation between Bose-Einstein condensation (BEC) and superfluidity in the ground state of a one-dimensional model of interacting Bosons in a strong random potential. We prove rigorously that in a certain parameter regime the superfluid fraction can be arbitrarily small while complete BEC prevails. In another regime there is both complete BEC and complete superfluidity, despite the strong disorder. This is joint work with M. Könenberg, T. Moser and R. Seiringer.