Solitons in the Salerno model with competing nonlinearities.

  title={Solitons in the Salerno model with competing nonlinearities.},
  author={Jes{\'u}s G{\'o}mez-Garde{\~n}es and Boris A. Malomed and Luis Mario Flor{\'i}a and A. R. Bishop},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={73 3 Pt 2},
We consider a lattice equation (Salerno model) combining onsite self-focusing and intersite self-defocusing cubic terms, which may describe a Bose-Einstein condensate of dipolar atoms trapped in a strong periodic potential. In the continuum approximation, the model gives rise to solitons in a finite band of frequencies, with sechlike solitons near one edge, and an exact peakon solution at the other. A similar family of solitons is found in the discrete system, including a peakon; beyond the… CONTINUE READING

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