Superfluidity of Bose—Einstein condensates in ultracold atomic gases*
Zhu Qi-Zhonga), Wu Biaoa),b),c)†
       
Distribution of the spin current densities (a), (b), and (c) of the ground state shown in Fig.  8 . The length of the arrows represents the strength of the spin current. The arrow length of different subfigures is not to scale. κ = 0.04. Units of the X and Y axes are a h.