|Publication date||30 Mar 2006|
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.
- nonlinear Schrödinger lattices, photorefractive, localised travelling wave, embedded soliton