Dissipative transfer of a quantum particle in a dimer with random fluctuating intersite matrix element

摘要

Kinetic equations of the quantum particle motion in a symmetric dimer are studied for the case of fluctuating site energies and a fluctuating intersite coupling matrix element. Modulations of the site energies are incorporated via quantum fluctuations of a thermal bath whereas the fluctuations of the intersite coupling are taken into account by a stochastic description. In contrast to the quantum fluctuations which are considered in the weak coupling limit, the stochastic fluctuations are included in an exact manner. The exact solution of the averaged kinetic equations are obtained in the case of an Ohmic thermal bath with a white noise spectrum and dichotomous fluctuations of the intersite coupling.