Localized Structures in Nonlinear Lattices with Diffusive Coupling and External Driving

Mitkov, Igor; Kladko, Konstantin; Bishop, A. R.

Localized Structures in Nonlinear Lattices with Diffusive Coupling and External Driving

Authors

Mitkov, Igor

Kladko, Konstantin

Bishop, A. R.

Description

We study the stabilization of localized structures by discreteness in one-dimensional lattices of diffusively coupled nonlinear sites. We find that in an external driving field these structures may lose their stability by either relaxing to a homogeneous state or nucleating a pair of oppositely moving fronts. The corresponding bifurcation diagram demonstrates a cusp singularity. The obtained analytic results are in good quantitative agreement with numerical simulations.
4 pages, 5 figures, revtex