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Nucleation of breathers via stochastic resonance in nonlinear lattices
David Cubero1, Jesús Cuevas, P G Kevrekidis
1Departamento de Física Aplicada I, EUP, Universidad de Sevilla, 41011 Sevilla, Spain.
Abstract:
By applying a staggered driving force in a prototypical discrete model with a quartic nonlinearity, we demonstrate the spontaneous formation and destruction of discrete breathers with a selected frequency due to thermal fluctuations. The phenomenon exhibits the striking features of stochastic resonance: a nonmonotonic behavior as noise is increased and breather generation under subthreshold conditions. The corresponding peak is associated with a matching between the external driving frequency and the breather frequency at the average energy given by ambient temperature.
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