Josephson dynamics of a spin-orbit-coupled Bose-Einstein condensate in a double-well potential

Dan-Wei Zhang; Li-Bin Fu; Z. D. Wang; Shi-Liang Zhu

doi:10.1103/PhysRevA.85.043609

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Josephson dynamics of a spin-orbit-coupled Bose-Einstein condensate in a double-well potential

Dan-Wei Zhang, Li-Bin Fu, Z. D. Wang, Shi-Liang Zhu

DOI 10.1103/PhysRevA.85.043609 · Physical Review A

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Abstract

We investigate the quantum dynamics of an experimentally realized spin-orbit-coupled Bose-Einstein condensate in a double-well potential. The spin-orbit coupling can significantly enhance the atomic interwell tunneling. We find the coexistence of internal and external Josephson effects in the system, which are moreover inherently coupled in a complicated form even in the absence of interatomic interactions. Moreover, we show that the spin-dependent tunneling between two wells can induce a net atomic spin current referred as spin Josephson effects. Such spin Josephson effects can be observable under realistic conditions.