Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.49: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Absorption and Transfer properties of quantum aggregates under the influence of Lévy-stable disorder — •Sebastian Möbius1, Sebastiaan M. Vlaming1,2, Victor A. Malyshev2, Jasper Knoester2, and Alexander Eisfeld1 — 1Max Planck Institute for Physics of Complex Systems, Nöthnitzer Strasse 38, D-01187 Dresden, Germany — 2Centre for Theoretical Physics and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
Molecular aggregates exhibit extraordinary absorption properties, depending on their geometrical conformation and inter-monomeric coupling. The shape of the narrow 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 contribution 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 on how the environment generates disorder distributions with heavy tails, so called Lévy-stable distributions. We also show that the Lévy distributions lead to even a broadening of the absorption band [1] as well as a subdiffusive exciton transfer.
[1] A. Eisfeld, S.M. Vlaming, V.A. Malyshev, J. Knoester, PRL 105, 137402 (2010)