http://arxiv.org/abs/1503.07976
We study multiple period states of a superfluid Fermi gas in an optical lattice along the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensate (BEC) crossover. The existence of states whose period is a multiple of the lattice spacing is a consequence of the non-linear behavior of the gas, which is due to the presence of the order parameter associated with superfluidity. By solving Bogoliubov-de Gennes equations we find that, in the BCS side of the crossover, the multiple period states can be energetically favorable compared to the normal Bloch states and their survival time against dynamical instability drastically increases, suggesting that these states can be accessible in current experiments with ultracold gases. This is in sharp contrast to the situation in BECs.
S. Yoon, F. Dalfovo, T. Nakatsukasa, et. al.
Mon, 30 Mar 15
40/65
Comments: 5 pages, 5 figures
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