Josephson dynamics of a spin-orbit coupled Bose-Einstein condensate in a   double well potential
  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 inter-well 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 novel spin Josephson effects can be observable for realistically experimental conditions. 
Dan-Wei Zhang, Li-Bin Fu, Z. D. Wang, and Shi-Liang Zhu
cond-mat.quant-gas