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

Year: 2013

Authors: Ozawa T., Pitaevskii L.P., Stringari S.

Autors Affiliation: Università degli studi di Trento, INO CNR BEC Ctr, I-38123 Povo, Italy
University of Trento, Dipartimento Fis, I-38123 Povo, Italy
Russian Academy of Sciences, Kapitza Inst Phys Problems, Moscow 119334, Russia

Abstract: We investigate the stability of supercurrents in a Bose-Einstein condensate with one-dimensional 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 a 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 the energetic instabilities in these systems can be generated experimentally through excitation of the collective dipole oscillation.


Volume: 87 (6)      Pages from: 063610-1  to: 063610-5

More Information: We thank Shuai Chen and Hui Zhai for clarifying discussions of their experiment [17]. T.O. thanks Zeng-Qiang Yu for useful discussions of Ref. [19]. This work was supported by the ERC through the QGBE grant and by Provincia Autonoma di Trento.
DOI: 10.1103/PhysRevA.87.063610

Citations: 53
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