Observation of Hybrid Soliton Vortex-Ring Structures in Bose-Einstein   Condensates
  We present the experimental discovery of compound structures comprising solitons and vortex rings in Bose-Einstein condensates (BECs). We examine both their creation via soliton-vortex collisions and their subsequent development, which is largely governed by the dynamics of interacting vortex rings. A theoretical model in three-dimensional (3D) cylindrical symmetry is also presented. 
Naomi S. Ginsberg, Joachim Brand, Lene Vestergaard Hau