Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 14, Pages 3053-3056Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3053
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Chains of parametrically driven, damped pendula are known to support solitonlike clusters of in-phase motion which become unstable and seed spatiotemporal chaos for sufficiently large driving amplitudes. We show that the pinning of the soliton on a long impurity (a longer pendulum) expands dramatically its stability region, whereas short defects simply repel solitons producing an effective partition of the chain. We also show that defects may spontaneously nucleate solitons.
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