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Biphonons in the beta-Fermi-Pasta-Ulam model
(Physica. D: Nonlinear Phenomena, 2006)
Discrete breathers or intrinsic localized modes are nonlinear localized states that appear in several classical extended systems, such as for instance the Fermi-Paste-Ulam (FPU) model. In order to probe the quantum states ...
Bifurcation analysis of the localized modes dynamics in lattices with saturable nonlinearity
(Physica. D: Nonlinear Phenomena, 2006)
The dynamics of localized modes in discrete media with saturable nonlinearity are investigated. The stability of stationary bright solitons is discussed from the view point of the energy minimum principle and mapping ...