Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 17: Femtosecond Spectroscopy IV
MO 17.4: Vortrag
Donnerstag, 15. März 2012, 11:30–11:45, V38.03
Energy Transfer in Light-Harvesting Systems: Influence of Non-Markovian Environment — •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
The transfer of electronic excitation energy as well as optical properties of complexes of interacting chromophores, e.g. the FMO complex or the LH2 antennae in biological photosynthetic systems, are strongly influenced by an environment. For a proper theoretical description it is essential to include non-Markovian effects resulting from an electron-environment coupling that is a rather structured function of energy leading to a complicated retroaction on the excitation dynamics.
We developed a new approach based on non-Markovian quantum state diffusion [1] where it is possible to efficiently calculate energy transfer and optical spectra in a non-perturbative way. Within this method, it is possible to capture the whole range from coherent dynamics to incoherent diffusion and to investigate situations where environment-assisted transfer occurs.
Using that approach we described the energy transfer dynamics in one FMO subunit as well as in the full FMO trimer [2, 3] and calculated linear spectra at various temperatures.
[1] Roden et al. PRL 103, 058301 (2009)
[2] Ritschel et al. NJP 13, 113034 (2011)
[3] Ritschel et al. JPCL 2, 2912 (2011)