Abstract
In a polymer chain, an extra electron or hole will distort the chain to form a charged polaron. Under the influence of an applied electric field, the polaron will be accelerated for a short time and then move at a constant velocity while it will be dissociated for the field being stronger than a threshold. Within a dynamical non-adiabatic evolution method, we simulate the motion of polaron under the influence of the electric field which is present for different periods. (1) We find the lattice oscillation behind the polaron is a moving multi-breather excitation, which bears the incresed energy due to the electric field acting on the polaron, so that the polaron can move at a constant speed even in the presence of an electric field. (2) We present a full picture for the polaron scattering from an impurity, which may trap or repulse the charged polaron.
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