Use this identifier to quote or link this document:

Energy relaxation in nonlinear one-dimensional lattices
Reigada Sanz, Ramon; Sarmiento, A.; Lindenberg, K.
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.
Física estadística
Dinàmica reticular
Statistical physics
Lattice dynamics
(c) American Physical Society, 2001
The American Physical Society

Show full item record

Related documents

Other documents of the same author

Lindenberg, K.; Sancho, Jose Maria; Lacasta Palacio, Ana María; Sokolov, Igor M.
Gleeson, James P.; Sancho, Jose Maria; Lacasta Palacio, Ana María; Lindenberg, K.
Sancho, Jose Maria; Khoury, M.; Lindenberg, K.; Lacasta Palacio, Ana María
Lindenberg, K.; Lacasta Palacio, Ana María; Sancho Herrero, Jose Maria; Romero, A. H.
Sancho, Jose Maria; Lacasta Palacio, Ana María; Lindenberg, K.; Sokolov, Igor M.; Romero, A. H.