Interaction of discrete breathers with thermal fluctuations

• Veröffentlicht in: Физика низких температур
• Datum: 2008
• ISSN: 0132-6414
• Hauptverfasser: Eleftheriou, M., Flach, S.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2008
• Schlagworte: Низкоразмерные и неупорядоченные системы
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/117342
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: Interaction of discrete breathers with thermal fluctuations
 / M. Eleftheriou, S. Flach // Физика низких температур. — 2008. — Т. 34, № 7. — С. 701–706. — Бібліогр.: 25 назв. — англ.

Discrete breathers (DB) are time-periodic and spatially localized lattice excitations, which can be linearly
 stable or unstable with respect to either localized or extended perturbations. We analyze the interaction
 of DBs with a thermalized background of small amplitude lattice excitations in a one-dimensional lattice of
 Morse oscillators with nearest neighbour interaction. We find that stable DBs are barely influenced by the
 thermal noise. Unstable DBs are starting to propagate through the lattice, without loosing their localization
 character. The instability can be both due to localized perturbations, as well as due to extended perturbations.
 We discuss these observations in terms of resonances of DBs with localized and delocalized perturbations,
 and relate them to the issue of DB impact on statistical properties of nonlinear lattices.