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

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.

5 pages, 3 figures, published version

References in corpus (6)

• Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
• Anisotropic dynamics of a spin-orbit coupled Bose-Einstein condensate
• Phase diagram for a Bose-Einstein condensate moving in an optical lattice
• Stability of ultracold atomic Bose condensates with Rashba spin-orbit coupling against quantum and thermal fluctuations
• Sum rules, dipole oscillation and spin polarizability of a spin-orbit coupled quantum gas
• Critical velocity of superfluid flow through single barrier and periodic potentials

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• The Pairing of Spin-orbit Coupled Fermi Gas in Optical Lattice
• Dynamics of quantized vortices in Bose-Einstein condensates with laser-induced spin-orbit coupling
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• Double unstable avoided crossings and complex domain patterns formation in spin-orbit coupled spin-1 condensates
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• Multicomponent Superfluids and Superconductors in Dense Nuclear and Quark Matter
• Topological superfluids in two-dimensional Fermi gas with Rashba spin-orbit coupling
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