title: Exciton dynamics in chromophore aggregates with correlated environment fluctuations.
abstract: We study the effects of correlated molecular transition energy fluctuations in molecular aggregates on the density matrix dynamics, and their signatures in the optical response. Correlated fluctuations do not affect single-exciton dynamics and can be described as a nonlocal contribution to the spectral broadening, which appears as a multiplicative factor in the time-domain response function. Intraband coherences are damped only by uncorrelated transition energy fluctuations. The signal can then be expressed as a spectral convolution of a local contribution of the uncorrelated fluctuations and the nonlocal contribution of the correlated fluctuations.
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, Jilin University, People's Republic of China. darius.abramavicius@ff.vu.lt
authors.forename: Darius
authors.initials: D
authors.lastname: Abramavicius
authors.forename: Shaul
authors.initials: S
authors.lastname: Mukamel