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Impurity Modes and Wave Scattering in Discrete Chains with Nonlinear Defect States

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Molina, Mario I
Vicencio, Rodrigo
Kivshar, Yuri

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Elsevier

Abstract

We study the properties of localized impurity modes and the transmission of plane waves across a general nonlinear impurity embedded in an infinite one-dimensional linear chain. Using the formalism of the lattice Green function, we obtain nonlinear equations for the bound state energy and the transmission coefficient, for a wide class of nonlinear impurities. We specialize to a saturable nonlinear impurity, obtaining closed form expressions for the bound state energy and transmission coefficient.

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Physics Letters A

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2037-12-31