Energy thresholds for discrete breathers in one-, two- and three-dimensional lattices

Abstract

Discrete breathers are time-periodic, spatially localized solutions of equations of motion for classical degrees of freedom interacting on a lattice. They come in one-parameter families. We report on studies of energy properties of breather families in one-, two- and three-dimensional lattices. We show that breather energies have a positive lower bound if the lattice dimension of a given nonlinear lattice is greater than or equal to a certain critical value. These findings could be important for the experimental detection of discrete breathers.

10 pages, LaTeX, 4 figures (ps), Physical Review Letters, in print

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