Excitons in molecular aggregates with Lévy-type disorder: anomalous localization and exchange broadening of optical spectra

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 wi...

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Bibliographic Details
Published in:Physical review letters 2010-09, Vol.105 (13), p.137402-137402, Article 137402
Main Authors: Eisfeld, A, Vlaming, S M, Malyshev, V A, Knoester, J
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.105.137402