Statistical mechanics of a Feshbach coupled Bose-Fermi gas in an optical lattice

Details Statistical mechanics of a Feshbach coupled Bose-Fermi gas in an optical lattice Statistical mechanics of a Feshbach coupled Bose-Fermi gas in an optical lattice

2008-10-15

arxiv.org/abs/0810.2696v2

Phys. Rev. A 79, 053601 (2009)

Physics

Condensed Matter

Other Condensed Matter

9 pages, 5 figures

Scientific paper

10.1103/PhysRevA.79.053601

We consider an atomic Fermi gas confined in a uniform optical lattice potential, where the atoms can pair into molecules via a magnetic field controlled narrow Feshbach resonance. The phase diagram of the resulting atom-molecule mixture in chemical and thermal equilibrium is determined numerically in the absence of interactions under the constraint of particle conservation. In the limiting cases of vanishing or large lattice depth we derive simple analytical results for important thermodynamic quantities. One such quantity is the dissociation energy, defined as the detuning of the molecular energy spectrum with respect to the atomic one for which half of the atoms have been converted into dimers. Importantly we find that the dissociation energy has a non-monotonic dependence on lattice depth.

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