Controllable soliton emission from a Bose-Einstein condensate
  We demonstrate, through numerical simulations, the controllable emission of matter-wave bursts from a Bose-Einstein Condensate in a shallow optical dipole trap. The process is triggered by spatial variations of the scattering length along the trapping axis. In our approach, the outcoupling mechanism are atom-atom interactions and thus, the trap remains unaltered. Once emitted, the matter wave forms a robust soliton. We calculate analytically the parameters for the experimental implementation of this atomic soliton machine gun. 
Mar\'ia I. Rodas-Verde, Humberto Michinel and V\'ictor M.   P\'erez-Garc\'ia