Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster II
Q 30.13: Poster
Tuesday, March 3, 2009, 16:30–19:00, VMP 9 Poster
Fermionic Atoms in Optical Lattices — •Victor Bezerra1, Flavio S. Nogueira1, and Axel Pelster1,2 — 1Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Fachbereich Physik, Universität Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg, Germany
We investigate an interacting two-component Fermi gas in an optical lattice. To this end we analyze the underlying Hubbard Hamiltonian with an additional term which breaks explicitly the U(1) symmetry. Within a strong-coupling expansion, where the hopping energy is considered to be smaller than the interaction energy, we determine the phase diagram both at zero and at finite temperature. It turns out that our theory interpolates between the Mott insulating state with an unbroken and a BCS-like state with a broken U(1) symmetry. We point out applications for future experiments and the relevance of our results for the BEC-BCS crossover in optical lattices.