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

 

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Opened Access Moving discrete breathers in a Klein–Gordon chain with an impurity
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Author: Cuevas-Maraver, Jesús
Palmero Acebedo, Faustino
Archilla, Juan F. R.
Romero Romero, Francisco
Department: Universidad de Sevilla. Departamento de Física Aplicada I
Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Date: 2002
Published in: Journal of Physics A: Mathematical and General, 35(49), 10519-
Document type: Article
Abstract: We analyse the influence of an impurity in the evolution of moving discrete breathers in a Klein–Gordon chain with non-weak nonlinearity. Three different types of behaviour can be observed when moving breathers interact with the impurity: they pass through the impurity continuing their direction of movement; they are reflected by the impurity; they are trapped by the impurity, giving rise to chaotic breathers, as their Fourier power spectra show. Resonance with a breather centred at the impurity site is conjectured to be a necessary condition for the appearance of the trapping phenomenon. This paper establishes a difference between the resonance condition of the non-weak nonlinearity approach and the resonance condition with the linear impurity mode in the case of weak nonlinearity.
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URI: http://hdl.handle.net/11441/24533

DOI: 10.1088/0305-4470/35/49/302

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