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Moving discrete breathers in a Klein--Gordon chain with an impurity

J. Cuevas·F. Palmero·J. F. R. Archilla·F. R. Romero
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Abstract

We analyze the influence of an impurity in the movement of discrete breathers in Klein--Gordon chains. We observe that the moving breather can cross the impurity, can be reflected by it, or can be trapped originating a quasi-periodic breather. We find that resonance with a nonlinear localised mode centred in the impurity is a necessary condition in order to observe the trapping phenomenon, as a difference with the resonance condition with a linear localised mode when this problem is studied within the Nonlinear Schrödinger Equation approximation.

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J. Cuevas, F. Palmero, J. F. R. Archilla, F. R. Romero. 2002-03-13. Moving discrete breathers in a Klein--Gordon chain with an impurity. https://doi.org/10.1088/0305-4470%2F35%2F49%2F302

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