Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 41: Matter at Low Temperature: Quantum Liquids, Bose-Einstein-Condensates, Ultra-cold Atoms

TT 41.8: Vortrag

Donnerstag, 26. März 2009, 16:00–16:15, HSZ 105

Bose-Fermi Mixtures in Disordered Optical Lattices — •Denis Semmler, Irakli Titvinidze, Ulf Bissbort, and Walter Hofstetter — Institut für Theoretische Physik, J. W. Goethe-Universität, D-60438 Frankfurt, Germany

We study strongly interacting bosons and fermions in an optical lattice with correlated on-site disorder. For this purpose we use a stochastic, generalized DMFT scheme, treating the fermions within the well-known dynamical mean-field theory (DMFT) and describing the bosons by the Gutzwiller mean-field theory. This scheme becomes exact in the limit of infinite dimensions. In order to investigate localization phenomena we use the geometric average of the fermionic density of states as well as the geometrically averaged bosonic superfluid order parameter. Our investigation focuses on the influence of the fermions on the bosonic phase diagram, consisting of the Bose glass phase, the Mott insulator and the superfluid. We consider the corresponding fermionic phases, Mott insulator, Anderson insulator and disordered Fermi liquid, as well. The results are related to experimental parameters.