Non-hermitian exciton dynamics in a photosynthetic unit system

Details Non-hermitian exciton dynamics in a photosynthetic unit system Non-hermitian exciton dynamics in a photosynthetic unit system

2011-09-26

arxiv.org/abs/1109.5471v4

The Journal of Chemical Physics 136, 065104 (2012)

Physics

Quantum Physics

misprints corrected

Scientific paper

10.1063/1.3684654

The non-hermitian quantum dynamics of excitonic energy transfer in photosynthetic systems is investigated using a dissipative two-level dimer model. The approach is based on the Green's function formalism which permits consideration of decoherence and intersite transfer processes on comparable terms. The results indicate a combination of coherent and incoherent behavior at higher temperatures with the possibility of exceptional points occurring at the coherent-incoherent crossover regime at critical temperatures. When each dimer site is coupled equally to the environmental sources of dissipation, the excitonic wavepacket evolves with time with a coherent component, which can be attributed to the indistinguishability of the sources of dissipation. The time evolution characteristics of the B850 Bchls dimer system is analysed using typical parameter estimates in photosynthetic systems, and the quantum brachistochrone passage times are obtained for a range of parameters.

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