Interplay of Anderson localization and solitonic energy transport in the disordered Fermi-Pasta-Ulam chain

Autor:	G. S. Zavt, A. Lütze, R. Dusi, Max Wagner, G. Viliani
Rok vydání:	1995
Předmět:	Physics Momentum Anderson localization Chain (algebraic topology) Condensed matter physics General Chemical Engineering Quartic function Quantum mechanics Anharmonicity General Physics and Astronomy Soliton Anderson impurity model Excitation
Zdroj:	Philosophical Magazine B. 71:649-660
ISSN:	1463-6417 1364-2812
DOI:	10.1080/01418639508238554
Popis:	The basic aim of the present investigation is to get some insight into the role played by anharmonicity in the energy transport of disordered materials. We consider a harmonically disordered chain with a regular array of quartic nearest-neighbour anharmonicity (‘disordered Fermi-Pasta-Ulam chain’). Several unexpected features have been found. Some of these can be understood intuitively, whereas others remain surprising. For a single local displacement excitation (Q-excitation) we have found a constructive interplay of Anderson localization and a self-trapped localized soliton (ultra-Debye frequency), whereas for a single local momentum excitation (P-excitation) the interplay is conflicting (reduced Anderson localization, decay and boomerang effect of the hypersonic kink solitons). The most amazing feature is the genesis of longliving subsonic solitons, which hints at the possibility of practically unhindered energy propagation in disordered structures.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7e273f98e53fdf68fca62b0780ee2c17 https://doi.org/10.1080/01418639508238554 Zobrazit plný text záznamu