Stability of superfluid fermi gases in optical lattices

Yoshihiro Yunomae, Ippei Danshita, Daisuke Yamamoto, Nobuhiko Yokoshi, Shunji Tsuchiya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Critical velocities of superfluid Fermi gases in optical lattices are theoretically investigated across the BCS-BEC crossover. We calculate the excitation spectra in the presence of a superfluid flow in one- and two-dimensional optical lattices. It is found that the spectrum of low-lying Anderson-Bogoliubov (AB) mode exhibits a roton-like structure in the short-wavelength region due to the strong charge density wave fluctuations, and with increasing the superfluid velocity one of the roton-like minima reaches zero before the single-particle spectrum does. This means that superfluid Fermi gases in optical lattices are destabilized due to spontaneous emission of the roton-like AB mode instead of due to Cooper pair breaking.

Original languageEnglish
Title of host publicationProceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages41-44
Number of pages4
ISBN (Print)981428212X, 9789814282123
Publication statusPublished - 2009
Event9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008 - Hatoyama, Saitama
Duration: 2008 Aug 252008 Aug 28

Other

Other9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008
CityHatoyama, Saitama
Period08/8/2508/8/28

Keywords

  • Anderson-Bogoliubov mode
  • Critical velocity
  • Superfluidity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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  • Cite this

    Yunomae, Y., Danshita, I., Yamamoto, D., Yokoshi, N., & Tsuchiya, S. (2009). Stability of superfluid fermi gases in optical lattices. In Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008 (pp. 41-44). World Scientific Publishing Co. Pte Ltd.