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Bulletin of the American Physical Society

Atomic Fermi superfluids in a honeycomb optical lattice: Supercurrents and dynamical instabilities

Shunji Tsuchiya, R. Ganesh, Arun Paramekanti

Published Mar 21, 2011• 0 citations
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We study the stability of superfluid flow of two-component Fermi gases in one-dimensional optical lattices. We find that the density fluctuation mode, the so-called Anderson-Bogoliubov mode, has the roton-like structure as seen in superfluid 4 He. With increasing supercurrent, one of the roton-like minima reaches zero before the pair breaking occurs. This means that the instability of the superfluid Fermi gas is due to the spontaneous emission of the roton-like excitations of the Anderson-Bogoliubov mode instead of due to the Cooper pair breaking. We calculate the critical velocity determined by the roton-like structure for one-dimensional optical lattices.