title: Excitons in molecular aggregates with Lévy-type disorder: anomalous localization and exchange broadening of optical spectra.
abstract: We predict the existence of exchange broadening of optical line shapes in disordered molecular aggregates and a nonuniversal disorder scaling of the localization characteristics of the collective electronic excitations (excitons). These phenomena occur for heavy-tailed Lévy disorder distributions with divergent second moments-distributions that play a role in many branches of physics. Our results sharply contrast with aggregate models commonly analyzed, where the second moment is finite. They bear a relevance for other types of collective excitations as well.
authors.affiliation: Max Planck Institute for Physics of Complex Systems, Dresden, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Eisfeld
authors.forename: S M
authors.initials: SM
authors.lastname: Vlaming
authors.forename: V A
authors.initials: VA
authors.lastname: Malyshev
authors.forename: J
authors.initials: J
authors.lastname: Knoester