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.
|Publication status||Published - 30 Mar 2006|
- nonlinear Schrödinger lattices
- localised travelling wave
- embedded soliton