The longstanding problem of moving discrete breathers (intrinsic localised modes) in nonlinear Schrödinger lattices is revisited. The context is photorefractive crystal lattices with saturable nonlinearity whose generalised Peierls-Nabarro barrier vanishes for isolated coupling strength values. Genuinely localised travelling waves (i.e., moving discrete breathers) are computed as a function of the system parameters for the first time. The relevant solutions exist only for finite velocities.
Original languageEnglish
Publication statusPublished - 30 Mar 2006


  • nonlinear Schrödinger lattices
  • photorefractive
  • localised travelling wave
  • embedded soliton


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