Interaction of discrete breathers with thermal fluctuations
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 on...
Збережено в:
| Дата: | 2008 |
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| Автори: | , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2008
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| Назва видання: | Физика низких температур |
| Теми: | |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/117342 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | 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. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | 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. |
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