Phonon-assisted excitation energy transfer in photosynthetic systems

doi:10.1088/1674-1056/25/9/098201

Abstract The phonon-assisted process of energy transfer aiming at exploring the newly emerging frontier between biology and physics is an issue of central interest. This article shows the important role of the intramolecular vibrational modes for excitation energy transfer in the photosynthetic systems. Based on a dimer system consisting of a donor and an acceptor modeled by two two-level systems, in which one of them is coupled to a high-energy vibrational mode, we derive an effective Hamiltonian describing the vibration-assisted coherent energy transfer process in the polaron frame. The effective Hamiltonian reveals in the case that the vibrational mode dynamically matches the energy detuning between the donor and the acceptor, the original detuned energy transfer becomes resonant energy transfer. In addition, the population dynamics and coherence dynamics of the dimer system with and without vibration-assistance are investigated numerically. It is found that, the energy transfer efficiency and the transfer time depend heavily on the interaction strength of the donor and the high-energy vibrational mode, as well as the vibrational frequency. The numerical results also indicate that the initial state and dissipation rate of the vibrational mode have little influence on the dynamics of the dimer system. Results obtained in this article are not only helpful to understand the natural photosynthesis, but also offer an optimal design principle for artificial photosynthesis.

Keywords: excitation energy transfer high-energy intramolecular vibrational motion resonant coherent transfer

Received: 02 February 2016
Revised: 20 May 2016
Accepted manuscript online:

PACS:	82.20.Rp	(State to state energy transfer)
	42.50.Nn	(Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems)
	42.50.Wk	(Mechanical effects of light on material media, microstructures and particles)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11174233).

Corresponding Authors: Ai-Ping Fang, Hong-Rong Li
E-mail: apfang@mail.xjtu.edu.cn;hrli@mail.xjtu.edu.cn

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Hao Chen(陈浩), Xin Wang(王信), Ai-Ping Fang(方爱平), Hong-Rong Li(李宏荣) Phonon-assisted excitation energy transfer in photosynthetic systems 2016 Chin. Phys. B 25 098201

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[1]	Vibration-assisted coherent excitation energy transfer in a detuned dimer Xin Wang(王信), Hao Chen(陈浩), Chen-yu Li(李晨宇), Hong-rong Li(李宏荣). Chin. Phys. B, 2017, 26(3): 037105.

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