EFFECT OF TEMPERATURE ON INTRINSIC LOCALIZED MODES IN ANHARMONIC LATTICES

Autor:	V. I. Zubov, J. N. Teixeira Rabelo, E. S. Cardoso
Rok vydání:	2000
Předmět:	Physics Amplitude Condensed matter physics Field (physics) Anharmonicity Mode (statistics) Statistical and Nonlinear Physics Condensed Matter Physics Displacement (vector)
Zdroj:	Modern Physics Letters B. 14:1001-1007
ISSN:	1793-6640 0217-9849
DOI:	10.1142/s0217984900001233
Popis:	We study the effect of temperature on Intrinsic Localized Modes (ILM) in anharmonic lattices. An approach is proposed based on the Method of the Unsymmetrized Self-Consistent Field (USF). The special case of an odd-parity mode in an anharmonic linear chain with Mie–Lennard–Jones potential is investigated in more detail. We find that in the weak anharmonic approximation, an increasing of temperature does not change the pattern of the mode, leading to a very small decreasing of the displacement amplitudes and a decreasing of the mode frequency. The frequency of the mode increases with increasing of both the repulsion and attraction indexes. This effect is more sensitive to the repulsion index.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d758fe40d2a490f0cddfe6e4132aad76 https://doi.org/10.1142/s0217984900001233 Zobrazit plný text záznamu