Formation of a Matter-Wave Bright Soliton
  We report the production of matter-wave solitons in an ultracold lithium 7 gas. The effective interaction between atoms in a Bose-Einstein condensate is tuned with a Feshbach resonance from repulsive to attractive before release in a one-dimensional optical waveguide. Propagation of the soliton without dispersion over a macroscopic distance of 1.1 mm is observed. A simple theoretical model explains the stability region of the soliton. These matter-wave solitons open fascinating possibilities for future applications in coherent atom optics, atom interferometry and atom transport. 
L. Khaykovich, F. Schreck, G. Ferrari, T. Bourdel, J. Cubizolles, L.   D. Carr, Y. Castin, and C. Salomon