Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.56: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Absorption and transport properties of quantum aggregates with heavy-tailed disorder — •Sebastian Möbius1, Sebastiaan M. Vlaming1, Victor A. Malyshev2, Jasper Knoester2, and Alexander Eisfeld11Max Planck Intitute for physics of complex systems, Dresden, Germany — 2Centre for Theoretical Physics and Zernike Institute for Advanced Materials, University of Groningen, Netherlands

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 contribution to the energy fluctuations.

Recent developments in generating and trapping highly excited Rydberg atoms, allow for quantum simulations of molecular aggregates. We show that by controlling the environment, e.g. a polar background gas, non-Gaussian static disorder can be studied. We analyze how the environment generates disorder distributions with heavy tails, so called Lévy-stable distributions, and discuss novel effects in Levy disordered systems such as broadening of the absorption bandwidth [1] as well as a subdiffusive exciton transfer.[2]

[1] A. Eisfeld, S.M. Vlaming, V.A. Malyshev, J. Knoester, PRL 105, 137402 (2010) [2] S.M. Vlaming, V.A. Malyshev, A. Eisfeld, J. Knoester, JCP 138, 214316 (2013)

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