Stability of superfluid fermi gases in optical lattices

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

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルProceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008
出版社World Scientific Publishing Co. Pte Ltd
ページ41-44
ページ数4
ISBN(印刷版)981428212X, 9789814282123
出版ステータスPublished - 2009
イベント9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008 - Hatoyama, Saitama
継続期間: 2008 8 252008 8 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

ASJC Scopus subject areas

  • 原子分子物理学および光学

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