Degenerate Fermi gas in a combined harmonic-lattice potential

Year: 2007

Authors: Blakie P., Bezett A., Buonsante P.

Autors Affiliation: Univ Otago, Dept Phys, Jack Dodd Ctr Photon & Ultra Cold Atoms, Dunedin, New Zealand

Abstract: In this paper we derive an analytic approximation to the density of states for atoms in a combined optical lattice and harmonic trap potential as used in current experiments with quantum degenerate gases. We compare this analytic density of states to numerical solutions and demonstrate its validity regime. Our work explicitly considers the role of higher bands and when they are important in quantitative analysis of this system. Applying our density of states to a degenerate Fermi gas, we consider how adiabatic loading from a harmonic trap into the combined harmonic-lattice potential affects the degeneracy temperature. Our results suggest that occupation of excited bands during loading should lead to more favorable conditions for realizing degenerate Fermi gases in optical lattices.

Journal/Review: PHYSICAL REVIEW A

Volume: 75 (6)      Pages from: 063609-1  to: 063609-10

KeyWords: ultracold atoms; fermions; optical lattice; trap;
DOI: 10.1103/PhysRevA.75.063609

ImpactFactor: 2.893
Citations: 33
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