Berlin 2014 – scientific programme

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MO: Fachverband Molekülphysik

MO 17: Excitons and Excitation Transfer (SYET 2)

MO 17.4: Talk

Thursday, March 20, 2014, 15:00–15:15, BEBEL HS213

Vibronic speed-up of the excitation energy transfer in the Fenna-Matthews-Olson complex — •Peter Nalbach, Cesar A. Mujica-Martinez, and Michael Thorwart — I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstr. 9, 20355 Hamburg

We show that the efficient excitation energy transfer in the Fenna-Matthews-Olson molecular aggregate under realistic physiological conditions is fueled by underdamped vibrations of the embedding proteins. For this, we present numerically exact results for the quantum dynamics of the excitons in the presence of nonadiabatic vibrational states in the Fenna-Matthews-Olson aggregate employing a environmental fluctuation spectral function derived from experiments. Assuming the prominent 180 cm⁻¹ vibrational mode to be underdamped, we observe, on the one hand, besides vibrational coherent oscillations between different excitation levels of the vibration also prolonged electronic coherent oscillations between the initially excited site and its neighbours. On the other hand, however, the underdamped vibrations provide additional channels for the excitation energy transfer and by this increase the transfer speed by up to 30% . (ArXiv:1311.6363)