Hybrid discrete solitons.

@article{Pertsch2002HybridDS,
  title={Hybrid discrete solitons.},
  author={Thomas Pertsch and Ulf Peschel and Falk Lederer},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  year={2002},
  volume={66 6 Pt 2},
  pages={066604}
}
The existence and stability of discrete solitons in waveguide arrays exhibiting a linear variation of the effective index and a Kerr nonlinearity is studied. We find that the resonant coupling of the conventional discrete soliton to a linear Wannier-Stark state does not entail soliton decay. We rather observe the formation of a bound state where the Wannier-Stark state gets nonlinearly modified. This results in an infinite number of isolated branches of hybrid discrete solitons. 

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