Quantum Coherent Dynamics at Ambient Temperature in Photosynthetic Molecules
Quantum Coherent Dynamics at Ambient Temperature in Photosynthetic Molecules
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发表时间：
2011-08
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通讯作者：
Z. B. Walters
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作者：
Z. B. Walters
Photosynthetic antenna complexes are responsible for absorbing energy from sunlight and transmitting it to remote loca- tions where it can be stored. Recent experiments have found that this process involves long-lived quantum coherence between pigment molecules, called chromophores, which make up these complexes Expected to decay within 100 fs at room temperature, these coher- ences were instead found to persist for picosecond time scales, despite having no apparent isolation from the thermal environment of the cell. This paper derives a quantum master equation which describes the coherent evolution of a system in strong contact with a thermal environment. Conditions necessary for long coherence lifetimes are identified, and the role of coherence in efficient energy transport is illuminated. Static spectra and exciton transfer rates for the PE545 complex of the cryptophyte algae CS24 are calculated and shown to have good agreement with experiment.
