Energy transfer in photosynthetic systems
The determination of the pathways in excitonic energy transfer in photosynthetic systems has received a huge boost by the progress in femtosecond spectroscopy. In the Fenna-Matthews-Olson complex of the green sulfur bacteria long-lived quantum beats have been observed in the 2d echo-spectra as a function of the waiting-time between the laser pulses. These oscillations are interpreted as a signature of coherent exciton dynamics over picoseconds. We have implemented efficient algorithms using the hierarchical equations of motions (HEOM) to calculate the time-evolution of the density matrix representing the electronic excitations with the environment consisting of molecular vibrations [29].
Using this approch we have calculated in [33,34] 2d echo-spectra of the Fenna-Matthews-Olson complex at different temperatures and study how oscillations in the spectra are affected by the temperature and mode-distribution of the environment.
| [34] | Long-Lived Electronic Coherence in Dissipative Exciton-Dynamics of Light-Harvesting Complexes | |||
| C. Kreisbeck, T. Kramer | ||||
| (submitted) | article | arxiv | NASA | |
| [33] | Modelling of Oscillations in Two-Dimensional Echo-Spectra of the Fenna-Matthews-Olson Complex | |||
| B.Hein, C. Kreisbeck, T. Kramer, M. Rodríguez | ||||
| New Journal of Physics, 14, 023018 (2012) | article | Open Access | NASA | |
| [29] | High-performance solution of hierarchical equations of motions for studying energy-transfer in light-harvesting complexes | |||
| C. Kreisbeck, T. Kramer, M. Rodríguez, B.Hein | ||||
| Journal of Chemical Theory and Computation, 7, 2166 (2011) | article | arxiv | NASA | |