Dependence of thermal conductivity on discrete breathers in lattices.
We study the properties of heat conduction in chains of coupled particles subjected to different anharmonic on-site potentials. Particular emphasis is placed on the role of breathers in saturation of the thermal conductivity for chains with hard anharmonicity. When the chain particles are subject to on-site potentials with soft anharmonicity, we find a characteristic temperature, below which the conductivity decreases but while above which it increases.
Tsironis
G P
GP
Theory Division and Center for Nonlinear Studies, MS-B258, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Bishop
A R
AR
Savin
A V
AV
Zolotaryuk
A V
AV