Coherent emission of atomic soliton pairs by Feshbach-resonance tuning
  We present two simple designs of matter-wave beam splitters in a trapped Bose-Einstein Condensate (BEC). In our scheme, identical pairs of atomic solitons are produced by an adequate control --- in time and/or space --- of the scattering length. Our analysis is performed by numerical integration of the Gross-Pitaevskii equation and supported by several analytic estimates. Our results show that these devices can be implemented in the frame of current BEC experiments. The system has potential applications for the construction of a soliton interferometer. 
Humberto Michinel, \'Angel Paredes, Mar\'ia M. Valado, and David   Feijoo
cond-mat.quant-gas quant-ph