Regensburg 2013 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 33: Poster II
DY 33.63: Poster
Thursday, March 14, 2013, 17:00–19:00, Poster C
Energy Transfer and Optical Properties of Molecular Aggregates: Application of Non-Markovian Quantum State Diffusion — •Gerhard Ritschel1, Jan Roden1,3, Walter T. Strunz2, and Alexander Eisfeld1,4 — 1Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany — 2Technische Universität Dresden, Germany — 3University of California, Berkeley, USA — 4Harvard University, Cambridge, USA
The general non-Markovian quantum state diffusion method is used to calculate excitation energy transfer and optical spectra of molecular aggregates for various temperatures. With that approach it is possible to account for structured spectral densities explicitly containing internal vibrational modes of the molecules as well as phonons of an environment. Because the method is very efficient, systematic investigations with respect to parameter variations are possible. We apply the method to the photosynthetic Fenna-Matthews-Olson complex focussing particularly on the role of the recently discovered eighth chromophore, which is believed to play an important role in receiving excitation from the main light harvesting antenna, for excitation energy transfer through the aggregate. It is shown that the energy transfer changes qualitatively when site 8 is excited initially. Instead of the relatively fast transfer that is usually observed when the initial excitation is localized on site 1 or 6, an exponential-like decay of the excitation is found when initialization at site 8 is considered.