Current-induced instability of superfluid Fermi gases in optical lattices

Y. Yunomae, I. Danshita, D. Yamamoto, N. Yokoshi, S. Tsuchiya

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Abstract

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 4He. 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.

Original languageEnglish
Article number032128
JournalJournal of Physics: Conference Series
Volume150
Issue number3
DOIs
Publication statusPublished - 2009

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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