Monday, May 6, 2013

1305.0645 (Tomoki Ozawa et al.)

Supercurrent and dynamical instability of spin-orbit coupled ultracold
Bose gases

Tomoki Ozawa, Lev P. Pitaevskii, Sandro Stringari
We investigate the stability of supercurrents in a Bose-Einstein condensate with 1D spin-orbit and Raman couplings. The consequence of the lack of Galilean invariance is explicitly discussed. We show that in the plane wave phase, characterized by uniform density, the supercurrent state can become dynamically unstable, the instability being associated with the occurrence of a complex sound velocity, in a region where the effective mass is negative. We also discuss the emergence of energetic instability in these supercurrent states. We argue that both the dynamical and energetic instabilities in these systems can be generated experimentally through the excitation of the collective dipole oscillation.
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