Computer simulation of excitonic optical line shapes: transfer integral fluctuations with dichotomic coloured noise Original Research Article

For Frenkel excitons moving on cyclic and linear molecular chains (modeling in part photosynthetic antenna systems) we investigate the influence of dynamic and static disorder on their optical line shapes. The dynamic disorder describes the influence of vibrational degrees of freedom. In our recent papers we have taken into account fluctuations of the local excitation energy. Fluctuations of the transfer matrix element between neighbouring molecules will be treated in this paper. The fluctuations are represented by dichotomic Markov processes with coloured noise. We obtain a closed set of equations of motion for the correlation functions determining the optical line shape which is solved exactly. The line shapes are discussed for various sets of the model parameters.