BEC-BCS crossover in an optical lattice

Abstract

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.

4 pages, 3 figures

References in corpus (3)

• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Molecular Probe of Pairing in the BEC-BCS Crossover
• Molecules of Fermionic Atoms in an Optical Lattice

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• Spatially-modulated Superfluid States in Fermionic Optical Ladder Systems with Repulsive Interactions
• Unitarity in periodic potentials: a renormalization group analysis
• Variational Bose-Hubbard model revisited
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• Resonant Superfluidity in an Optical Lattice
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