Influence of randomly fluctuating forces and energy dissipation on soliton dynamics in transpolyacetylene

Abstract

The influence of the environment of transpolyacetylene on the soliton dynamics is studied by using the Su-Schrieffer-Heeger Hamiltonian and a Langevin approach in which random fluctuating forces and a damping term are added to Newton's equations of motion. The numerical results show that the neutral kink solutions remain stable until the interactions with the environment are of the same order of magnitude as the interactions along the chain.