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Movability of Localized Excitations in Nonlinear Discrete Systems - a Separatrix Problem

S. Flach·C. R. Willis
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Abstract

We analyze the effect of internal degrees of freedom on the movability properties of localized excitations on defect-free nonlinear Hamiltonian lattices by means of properties of a local phase space which is at least of dimension six. We formulate generic properties of a movability separatrix in this local phase space. We prove that due to the presence of internal degrees of freedom of the localized excitation it is generically impossible to define a Peierls-Nabarro potential in order to describe the motion of the excitations through the lattice. The results are verified analytically and numerically for Fermi-Pasta-Ulam chains.

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S. Flach, C. R. Willis. 1994-03-14. Movability of Localized Excitations in Nonlinear Discrete Systems - a Separatrix Problem. https://doi.org/10.1103/physrevlett.72.1777

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