Modulational Instabilities and Domain Walls in Coupled Discrete Nonlinear Schrödinger Equations

preprint2004arXivOpen access

Abstract

We consider a system of two discrete nonlinear Schrödinger equations, coupled by nonlinear and linear terms. For various physically relevant cases, we derive a modulational instability criterion for plane-wave solutions. We also find and examine domain-wall solutions in the model with the linear coupling.

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