BEC-BCS crossover in an optical lattice
Arnaud Koetsier, D. B. M. Dickerscheid, Henk T. C. Stoof
We present the microscopic theory for the BEC-BCS crossover of an atomic Fermi gas in an optical lattice, showing that the Feshbach resonance underlying the crossover in principle induces strong multiband effects. Nevertheless, the BEC-BCS crossover itself can be described by a single-band model since it occurs at magnetic fields that are relatively far away from the Feshbach resonance. A criterion is proposed for the latter, which is obeyed by most known Feshbach resonances in ultracold atomic gases.
arXiv:cond-mat/0604186•Physical Review A•Sep 28, 2006•30 citations