Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Solids at Low Temperature - Poster Session

TT 21.1: Poster

Mittwoch, 28. März 2007, 14:00–17:45, Poster A

Mixtures of bosons and fermions in optical lattices — •Irakli Titvinidze, Michiel Snoek, and Walter Hofstetter — Institut für Theoretische Physik Johann Wolfgang Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Deutschland

We study a mixture of bosonic and fermionic atoms in an optical lattice using Dynamical Mean Field Theory. The bosons and fermions interact via on-site Hubbard interactions. In addition, there is a on-site interaction between the bosons and the fermions. Since all interaction parameters can independently be chosen to be repulsive or attractive, this system exhibits an exceedingly rich phase diagram. We pay particular attention to the effect of the bosons on antiferromagnetism and the shifting of bosonic Mott transition due to the presence of the fermions. This model can be extended by a Feshbach term, which transform a bosonic molecule into two fermionic atoms and vice versa.