1212.2387 (Shao-Liang Zhang et al.)

Superfluidity and Stabilities of a Bose-Einstein condensate with
periodically modulated interatomic interaction    [PDF]

Shao-Liang Zhang, Zheng-Wei Zhou, Biao Wu

We study theoretically the superfluidity and stability of a Bose-Einstein condensate (BEC) whose interatomic scattering length is periodically modulated with optical Feshbach resonance. Our numerical study finds that the properties of this periodic BEC are strongly influenced by the modulation strength. When the modulation strength is small, only the Bloch waves close to the Brillouin zone edge suffer both Landau and dynamical instabilities. When the the modulation strength is strong enough, all Bloch waves become dynamically unstable. In other words, the periodic BEC loses its superfluidity completely.

View original: http://arxiv.org/abs/1212.2387