Stratification of Moving Multicomponent Bose-Einstein Condensates
  A mixture of the multicomponent Bose-Einstein condensate is considered, where each component moves with its own velocity. As a result of the relative motion, the mixture stratifies when the relative velocity reaches a critical value. Stability conditions for a binary moving mixture are derived and the critical velocity is found. 
V. I. Yukalov and E. P. Yukalova