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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster II

Q 55.10: Poster

Donnerstag, 11. März 2010, 16:00–19:00, Lichthof

Multiband renormalization of Bose-Fermi mixtures in optical lattices — •Alexander Mering and Michael Fleischhauer — Fachbereich Physik and research center OPTIMAS, Technische Universität Kaiserslautern

The physics of ultracold mixtures of bosons and fermions in optical lattices is considered in the framework of the Bose-Fermi-Hubbard model. Starting from the derivation of the full multi-band model by including all couplings from the first Bloch band to all higher bands, we derive an effective single band Hamiltonian. This single band model obeys renormalized model parameters and allows for a consideration of the higher band effects onto the mixture. The most important contribution is shown to arize from inter- and intraspecies nonlinear corrections to the tunneling rate. Including further first-band corrections this approach finally allows to study the influence of the higher bands as well as the fermionic species onto the superfluid to Mott insulator transition of the bosons as recently studied in experiments.