Polarized Fermi gases in asymmetric optical lattices
arXiv:0906.1937 · doi:10.1103/PhysRevA.81.023618
Abstract
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.
7 pages, 6 figures, published version
References in corpus (18)
- Direct Observation of the Superfluid Phase Transition in Ultracold Fermi Gases
- Phase diagram of a two-component Fermi gas with resonant interactions
- Attractive Fermi gases with unequal spin populations in highly elongated traps
- Phase diagram of a strongly interacting polarized Fermi gas in one dimension
- Finite temperature phase diagram of a polarised Fermi condensate
- Quasi-one-dimensional polarized Fermi superfluids
- Mean field phase diagrams of imbalanced Fermi gases near a Feshbach resonance
- Fulde-Ferrell-Larkin-Ovchinnikov states in one-dimensional spin-polarized ultracold atomic Fermi gases
- Finite temperature phase diagram of a polarized Fermi gas in an optical lattice
- Larkin-Ovchinnikov state in resonant Fermi gas
- FFLO state in 1, 2, and 3 dimensional optical lattices combined with a non-uniform background potential
- Superfluidity at the BEC-BCS crossover in two-dimensional Fermi gases with population and mass imbalance
- Pair correlations of a spin-imbalanced Fermi gas on two-leg ladders
- Phase Diagram of Cold Polarized Fermi Gas in Two Dimensions
- Superfluid-insulator transitions of the Fermi gas with near-unitary interactions in a periodic potential
- Finite temperature phase diagram of trapped Fermi gases with population imbalance
- Phase diagram of imbalanced fermions in optical lattices
- Interband physics in an ultra-cold Fermi gas in an optical lattice