Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 41: Poster: Ultra-cold plasmas and Rydberg systems
A 41.9: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.V
Effects of correlated disorder on optical properties of molecular aggregates — •Sebastian Möbius1, Sebastiaan M. Vlaming2, Victor A. Malyshev2, Jasper Knoester2, and Alexander Eisfeld1,3 — 1Max Planck Intitute for physics of complex systems, Dresden, Germany — 2Centre for Theoretical Physics and Zernike Institute for Advanced Materials, University of Groningen, Netherlands — 3Department for Chemistry and Chemical Biology, Harvard University, USA
The dynamical and optical properties of excitons in quantum aggregates are strongly influenced by static disorder, due to inhomogeneities in the environment. This disorder leads to variation of the site energies of the individual monomers, which in turn results in localization of the exciton wavefunctions. In most theoretical studies, an uncorrelated Gaussian static disorder of the site energies has been used, which results in a strong exchange narrowing of the optical absorption upon increasing the interaction between the monomers. Recent results have shown that for certain types of non-Gaussian (Levy-stable) distributions the opposite effect, broadening of the spectrum, can occur. For these type of distributions, only uncorrelated disorder has been studied so far. Using an atomistic model, we show how different types of system-environment interaction lead to various Levy-stable distributions. Within the model, correlations between molecular transition energies can be naturally taken into account. Furthermore, we propose a method to numerically generate correlated Levy-stable distributions.