BEC-BCS crossover in an optical lattice

Details BEC-BCS crossover in an optical lattice BEC-BCS crossover in an optical lattice

2006-04-06

arxiv.org/abs/cond-mat/0604186v2

Phys. Rev. A 74, 033621 (2006)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.74.033621

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.

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