Two-dimensional echo-spectra of the Fenna-Matthews-Olson complex |
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| Birgit Hein | |
| Universität Regensburg | |
| Recent experimental observations of time-dependent beatings in the two-dimensional echo-spectra of light-harvesting complexes at ambient temperatures have opened up the question whether coherence and wave-like behaviour plays a significant role in photosynthesis. I will present a numerical study of the absorption and echo-spectra of the Fenna-Matthews-Olson complex in chlorobium tepidum and analyse the requirements in the theoretical model needed to reproduce beatings in the calculated spectra. The energy transfer in the FMO pigment-protein complex is theoretically described by an exciton Hamiltonian coupled to a phonon bath which account for the pigments electronic and vibrational excitations respectively. I use the hierarchical equations of motions method to treat the strong couplings in a non-perturbative way and show that the oscillations in the two-dimensional echo-spectra persist in the presence of thermal noise and static disorder. (preprint avalible at arXiv:1110.1511v1) |