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An enhancement of localized nonlinear modes in coupled systems gives rise toa novel type of escape process. We study a spatially one dimensional set-upconsisting of a linearly coupled oscillator chain of $N$ mass-points situatedin a metastable nonlinear potential. The Hamilton-dynamics exhibits breathersolutions as a result of modulational instability of the phonon states. Thesebreathers localize energy by freezing other parts of the chain. Eventually thislocalised part of the chain grows in amplitude until it overcomes the criticalelongation characterized by the transition state. Doing so, the breathersignite an escape by pulling the remaining chain over the barrier. Even if theformation of singular breathers is insufficient for an escape, coalescence ofmoving breathers can result in the required concentration of energy. Comparedto a chain system with linear damping and thermal fluctuations the breathershelp the chain to overcome the barriers faster in the case of low damping. Withlarger damping, the decreasing life time of the breathers effectively inhibitsthe escape process.

Self-organized escape processes of linear chains in nonlinear potentials