Dresden 2006 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 16: Electronic Structure and Spectroscopy II
CPP 16.8: Talk
Wednesday, March 29, 2006, 16:30–16:45, ZEU 160
Optical Absorption and Energy Transport in Dendrimers — •Christoph Supritz1, Petr Chvosta2, and Peter Reineker1 — 1Department of Theoretical Physics, University of Ulm, 89069 Ulm — 2Department of Macromolecular Physics, Faculty of Mathematics and Physics, Charles University, Prague
Dendrimers are highly branched polymers which are expected to be useful, for example, as efficient artificial light harvesting systems (like in photosynthesis) in nano-technological applications. It is generally assumed that inside dendrimers energy is transported via Frenkel excitons, but at the moment it is not clear whether this energy transport occurs in a coherent (wavelike) manner or via an incoherent hopping process. In our model we take into account the exciton phonon interaction by introducing a heat bath that interacts with the exciton in a stochastic manner. In this way we can describe the coupled coherent and incoherent exciton transport inside dendrimers and calculate their linear optical absorption spectra in the framework of linear response theory. To mimic the influence of a reaction center (like in photosynthesis) on energy transport, we attach a sink to the dendrimer through which excitons can be taken out of the system. We present these results for a number of different dendrimer types.