Ab initio MO-CI based quantum master equation approach: Exciton dynamics of weakly and strongly coupled J-type aggregates

In order to investigate the time evolutions of electron and hole distributions in weakly and strongly coupled H2 dimer models, we employ a novel dynamic exciton expression derived from the exciton density matrices calculated by the quantum master equation combined with the ab initio molecular orbital (MO)-configuration interaction (CI) method. The oscillation of exciton distribution over the monomers is observed in case of small inter-monomer distance, where the coupled dipole approximation is invalid. The result originates in the covalent character of inter-monomer interaction in the first excited state, i.e., delocalized character of LUMO distribution.