Polarized Fermi gases in asymmetric optical lattices
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.
Keywords
Cite
@article{arxiv.0906.1937,
title = {Polarized Fermi gases in asymmetric optical lattices},
author = {Xiaoling Cui and Yupeng Wang},
journal= {arXiv preprint arXiv:0906.1937},
year = {2010}
}
Comments
7 pages, 6 figures, published version