Dresden 2011 – wissenschaftliches Programm
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SYMN: Intersectional Symposium Transport and Spectroscopy in Molecular Nanostructures
SYMN 1: Transport and Spectroscopy in Molecular Nanostructures
SYMN 1.4: Hauptvortrag
Mittwoch, 16. März 2011, 12:00–12:30, HSZ 01
Theory of light-harvesting in photosynthetic pigment-protein complexes — •Thomas Renger1, Marcel Schmidt am Busch1, M. El-Amine Madjet2, and Frank Müh1,2 — 1Johannes Kepler University Linz, Institute of Theoretical Physics, Altenberger Str. 69, 4040 Linz, Austria — 2Freie Universität Berlin, Institut für Chemie und Biochemie, Fabeckstr. 36a, 14195 Berlin, Germany
In photosynthesis, light energy absorbed in so called antenna or light-harvesting complexes is transferred via an exciton mechanism to a reaction center where it is used to drive electron transfer reactions. The quantum efficiency of the transfer is close to 100 percent, that is, all excitons created reach the reaction center. In order to bridge the gap between the crystal structures of these light-harvesting proteins and optical experiments probing their function, two essential problems need to be solved. On one hand, theories of optical spectra and excitation energy transfer have to be developed that take into account the pigment-pigment (excitonic) and the pigment-protein (exciton-vibrational) coupling on an equal footing. On the other hand, the parameters entering these theories need to be calculated from the structural data. I will give a summary of theories on dissipative quantum dynamics of photosynthetic excitons, of recent approaches to a structure-based calculation of the parameters of the theory and of applications on different light-harvesting and reaction center complexes revealing different strategies for efficient light-harvesting realized in different systems.