Polarized Fermi gases in asymmetric optical lattices

Details Polarized Fermi gases in asymmetric optical lattices Polarized Fermi gases in asymmetric optical lattices

2009-06-10

arxiv.org/abs/0906.1937v2

Phys. Rev. A. 81, 023618 (2010)

Physics

Condensed Matter

Quantum Gases

7 pages, 6 figures, published version

Scientific paper

10.1103/PhysRevA.81.023618

The zero-temperature phase diagrams of imbalanced two-species Fermi gases are investigated in asymmetric optical lattices with arbitrary potential depths, based on the exact spectrum instead of the Fermi-Hubbard model. We study the effect of lattice potentials and atomic densities to the fully paired Bardeen-Cooper-Schrieffer (BCS) state and particularly the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. It is found that the increasing lattice potential favors BCS at low densities because of the enhanced effective coupling; whereas FFLO is favored at intermediate densities when the system undergoes a dimensional crossover. Finally using local density approximation we study the evolution of phase profile in the presence of external harmonic traps by merely tuning the lattice potentials.

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