Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 41.7: Talk

Thursday, March 26, 2009, 15:45–16:00, HSZ 105

Bose-Fermi Mixtures in Optical Lattices — •Irakli Titvinidze, Michiel Snoek, and Walter Hofstetter — Institut für Theoretische Physik, Goethe-Universität, D-60438 Frankfurt, Germany

We study a mixture of strongly interacting bosons and fermions with on-site repulsion in optical lattices. We apply the generalized dynamical mean-field theory (GDMFT), which is exact in the infinite dimensions and reliably describes the full range from weak to strong coupling. First we consider spinless fermions. We perform calculations for commensurate filling of the fermions and bosons, in particular for the case when the fermions are half-filled, whereas the filling of the bosons is 3/2. Our calculations show two different Alternating Mott insulator (AMI) phases, in which the bosons are localized, but particle density wave order occurs. These two AMI phases are separated by a supersolid phase, where bosonic superfluidity coexists with large-amplitude particle density wave order. Furthermore we consider a mixture of two-component fermions and hard-core bosons, both at half-filling. In this case in addition to the supersolid and the AMI phase, we also obtain an antiferromagnetic phase.