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Title: Energy relaxation in nonlinear one-dimensional lattices
Author: Reigada Sanz, Ramon
Sarmiento, Antonio
Lindenberg, Katja
Keywords: Física estadística
Dinàmica reticular
Statistical physics
Lattice dynamics
Issue Date: 2001
Publisher: The American Physical Society
Abstract: We study energy relaxation in thermalized one-dimensional nonlinear arrays of the Fermi-Pasta-Ulam type. The ends of the thermalized systems are placed in contact with a zero-temperature reservoir via damping forces. Harmonic arrays relax by sequential phonon decay into the cold reservoir, the lower-frequency modes relaxing first. The relaxation pathway for purely anharmonic arrays involves the degradation of higher-energy nonlinear modes into lower-energy ones. The lowest-energy modes are absorbed by the cold reservoir, but a small amount of energy is persistently left behind in the array in the form of almost stationary low-frequency localized modes. Arrays with interactions that contain both a harmonic and an anharmonic contribution exhibit behavior that involves the interplay of phonon modes and breather modes. At long times relaxation is extremely slow due to the spontaneous appearance and persistence of energetic high-frequency stationary breathers. Breather behavior is further ascertained by explicitly injecting a localized excitation into the thermalized arrays and observing the relaxation behavior.
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It is part of: Physical Review E, 2001, vol. 64, núm. 6, p. 066608-1-066608-9
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ISSN: 1063-651X
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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