Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 40: Poster: Ultra-cold atoms, ions and BEC

A 40.19: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.V

Anisotropic pair-superfluidity of trapped two-component Bose gases — •Yongqiang Li, Liang He, and Walter Hofstetter — Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, 60438 Frankfurt/Main, Germany

We theoretically simulate the pair-superfluid phase of homogeneous and trapped two-component ultracold gases in an optical lattice with attractive inter-species interactions, by means of Bosonic Dynamical Mean Field Theory. We obtain the phase diagram for filling n=1 at zero and finite temperature for asymmetric parameters in a three dimensional optical lattice, and confirm the stability of pair superfluidity in a wide range of parameters. We calculate the critical temperature of the pair-superfluid phase. In the presence of an external trap, we discuss the effects of inhomogeneity and imbalance between the two species on the pair-superfluid phase.