Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 38: Matter At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...

TT 38.1: Talk

Friday, February 29, 2008, 10:15–10:30, H 3010

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

We study a mixture of strongly interacting bosons and fermions with on-site repulsion in a three-dimensional optical lattice. We apply a generalized DMFT (gDMFT) scheme, which is exact in infinite dimensions and reliably describes the full range from weak to strong coupling. In first instance we restrict ourselves to the case of a mixture of bosons and spinless fermions at half filling. In this case a supersolid forms for weak Bose-Fermi repulsion, in which bosonic superfluidity coexists with charge-density wave order. For stronger interspecies repulsion the bosons become localized while the charge density wave order persists. The system is unstable against phase separation for weak repulsion among the bosons. Extending this to the case of spinfull fermions, we also find an antiferromagnetic phase.

[1] I. Titvinidze, M. Snoek, and W. Hofstetter; preprint: arXiv:0708.3241