Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster Session Transport & Matter at Low Temperature
TT 58.36: Poster
Donnerstag, 14. März 2013, 15:00–19:00, Poster D
Absorption and transfer properties of quantum aggregates under the influence of Lévy-stable disorder — Sebastian Möbius1, •Sebastiaan M. Vlaming1,2,3, Victor A. Malyshev2, Jasper Knoester2, and Alexander Eisfeld1 — 1Max Planck Institute for Physics of Complex Systems, Dresden, Germany — 2Centre for Theoretical Physics and Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands — 3Department of Chemistry and Center for Excitonics, Massachusetts Institute of Technology, Cambridge, USA
Molecular aggregates exhibit extraordinary absorption properties, depending on their geometrical conformation and inter-monomeric coupling. The narrowing of the absorption band for J-aggregates can be well described by diagonal Gaussian static disorder for individual site energies. Aggregates consisting of large molecules are usually embedded in complex environments, making it impossible to separate individual contributions to the energy fluctuations.
Recent developments in generating and trapping highly excited Rydberg atoms allow for quantum simulations of molecular aggregates. By controlling the environment, e.g. a polar background gas, static disorder besides Gaussian can be studied. We analyze how the environment generates disorder distributions with heavy tails, so called Lévy-stable distributions. These distributions can lead to broadening of the absorption bandwidth [1] as well as subdiffusive exciton transfer.
[1] A. Eisfeld, S.M. Vlaming, V.A. Malyshev, J. Knoester, PRL 105, 137402 (2010)