Rydberg-induced Solitons: Three-dimensional Self-trapping of Matter   Waves
  We propose a scheme for the creation of stable three dimensional bright solitons in Bose-Einstein condensates, i.e., the matter-wave analog of so-called spatio-temporal "light bullets". Off-resonant dressing to Rydberg $nD$-states is shown to provide nonlocal attractive interactions, leading to self-trapping of mesoscopic atomic clouds by a collective excitation of a Rydberg atom pair. We present detailed potential calculations, and demonstrate the existence of stable solitons under realistic experimental conditions by means of numerical simulations. 
F. Maucher, N. Henkel, M. Saffman, W. Kr\'olikowski, S. Skupin and T.   Pohl
physics.atom-ph cond-mat.quant-gas nlin.PS