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MO: Fachverband Molekülphysik

MO 14: Transport and Spectroscopy in Molecular Nanostructures (related to SYMN, jointly with CPP)

MO 14.5: Talk

Wednesday, March 16, 2011, 15:00–15:15, ZEU 160

Excitons in Molecular Aggregates with Lévy Disorder: Anomalous Localization and Exchange Broadening of Optical Spectra — •Alexander Eisfeld¹, Sebastiaan Vlaming², Victor Malyshev², and Jasper Knoester² — ¹MPI-PKS Dresden — ²University of Groningen

We predict the existence of exchange broadening of optical lineshapes 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.

Phys. Rev. Lett. 105, 137402 (2010)