Probably of interest to people working on FMO,
Best,
Stephanie
Sent to you by quebe via Google Reader: The Physical Basis for
Long-lived Electronic Coherence in Photosynthetic Light Harvesting
Systems. (arXiv:1107.0322v1 [quant-ph]) via quant-ph updates on
arXiv.org by <a
href="http://arxiv.org/find/quant-ph/1/au:+Pachon_L/0/1/0/all/0/1"…
A. Pachon</a>, <a
href="http://arxiv.org/find/quant-ph/1/au:+Brumer_P/0/1/0/all/0/1"…
Brumer</a> on 7/4/11
The physical basis for observed long-lived electronic coherence in
photosynthetic light-harvesting systems is identified using an
analytically soluble model. Three physical features are found to be
responsible for their long coherence lifetimes: i) an {\it effective}
low temperature regime and its implicit non-Markovian character, ii)
the small energy gap between excitonic states, and iii) the small ratio
of the energy gap to the coupling between excitonic states. Using this
approach, we obtain decoherence times for a dimer model with FMO
parameters of $\approx$ 160 fs at 77 K and $\approx$ 80 fs at 277 K. As
such, significant oscillations are found to persist for 600 fs and 300
fs, respectively, in accord with the experiment and with previous
computations. Similar good agreement is found for PC645 at room
temperature, with oscillations persisting for 400 fs. The analytic
expressions obtained provide direct insight into the parameter
dependence of the decoherence time scales.
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