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TT: Fachverband Tiefe Temperaturen

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

TT 41.11: Vortrag

Donnerstag, 26. März 2009, 16:45–17:00, HSZ 105

Asymmetric Hubbard Model for Ultracold Fermi-Mixtures on Optical Lattices — •Tobias Gottwald and Peter van Dongen — KOMET 337, Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz

In order to understand the phases occurring in ultracold Fermi-Mixtures we perform a mean-field analysis beyond LDA of an attractive-U Hubbard model with asymmetric hopping t_↑≠ t_↓ and a superimposed parabolic trapping potential. Depending on population numbers and on the asymmetry of the hopping we expect charge-density-wave-, BCS- or FFLO-states to minimize the relevant thermodynamic potential. By tuning the asymmetry in the hopping term we can switch between standard Hubbard model physics, where only superfluidity occurs, and Falikov-Kimball model physics, where only CDW-behaviour occurs.