The Physical Basis for Long-lived Electronic Coherence in Photosynthetic Light Harvesting Systems

Details The Physical Basis for Long-lived Electronic Coherence in Photosynthetic Light Harvesting Systems The Physical Basis for Long-lived Electronic Coherence in Photosynthetic Light Harvesting Systems

2011-07-01

arxiv.org/abs/1107.0322v2

J. Phys. Chem. Lett. 2, 2728 (2011)

Physics

Quantum Physics

5 figures; J. Phys. Chem. Lett. (2011)

Scientific paper

10.1021/jz201189p

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) the small energy gap between excitonic states, ii) the small ratio of the energy gap to the coupling between excitonic states, and iii) the fact that the molecular characteristics place the system in an effective low temperature regime, even at ambient conditions. 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.

Affiliated with

Also associated with

No associations

Rating

The Physical Basis for Long-lived Electronic Coherence in Photosynthetic Light Harvesting Systems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Physical Basis for Long-lived Electronic Coherence in Photosynthetic Light Harvesting Systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Physical Basis for Long-lived Electronic Coherence in Photosynthetic Light Harvesting Systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-174870