Superfluidity of Bose—Einstein condensates in ultracold atomic gases*
Zhu Qi-Zhonga), Wu Biaoa),b),c)†
       
Elementary excitations of a BEC flow with the SOC. (a) k = 1; (b) k = 3; (c) k = 4. C 1 = 10, C 2 = 4, and γ = 1.