Origin of Long Lived Coherences in Light-Harvesting Complexes

Details Origin of Long Lived Coherences in Light-Harvesting Complexes Origin of Long Lived Coherences in Light-Harvesting Complexes

2012-01-30

arxiv.org/abs/1201.6325v1

Physics

Biological Physics

4 pages, 2 figures

Scientific paper

A vibronic exciton model is developed to investigate the origin of long lived coherences in light-harvesting complexes. Using experimentally determined parameters and uncorrelated site energy fluctuations, the model predicts oscillations in the nonlinear spectra of the Fenna-Matthews-Olson (FMO) complex with a dephasing time of 1.3 ps at 77 K. These oscillations correspond to the coherent superposition of vibronic exciton states with dominant contributions from vibrational excitations on the same pigment. Purely electronic coherences are found to decay on a 200 fs timescale.

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