Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 14: Poster 2: Biomolecules, Electronic Spectroscopy, Experimental Techniques, Quantum Chemistry, Various Topics
MO 14.5: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.IV
Energy Transfer and Optical Spectra of the Fenna-Matthews-Olson Complex: Application of NMQSD Master Equation — •Gerhard Ritschel1, Jan Roden2, Walter T. Strunz3, and Alexander Eisfeld4 — 1Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany — 2University of California, Berkeley, USA — 3Technische Universität Dresden, Germany — 4Harvard University, Cambridge, USA
A master equation derived from non-Markovian quantum state diffusion [1] is used to calculate the excitation energy transfer and optical spectra of the photosynthetic Fenna-Matthews-Olson complex at various temperatures [2]. This approach allows us to treat spectral densities that explicitly contain the coupling to internal vibrational modes of the chromophores. Moreover, the method is very efficient making systematic investigations with respect to parameter variations tractable.
Particular attention is paid to the recently discovered eighth chromophore, which is believed to play an important role in receiving excitation from the main light harvesting antenna. When site 8 is excited initially, we see a slow exponential-like decay of the excitation which is in contrast to the oscillations and a relatively fast transfer that usually occurs when initialization at sites 1 or 6 is considered [3]. We show that different sets of electronic transition energies can lead to large differences in the energy transfer dynamics and to different linear spectra.
[1] Roden et al. PRL 103, 058301 (2009)
[2] Ritschel et al. NJP 13, 113034 (2011)
[3] Ritschel et al. JPCL 2, 2912 (2011)