Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Physics, University of Otago, Dunedin 9016, New Zealand.
Department of Chemistry, Boston University, Boston, Massachusetts 02215, USA.
J Chem Phys. 2019 Feb 28;150(8):085102. doi: 10.1063/1.5048058.
Energy transport in photosynthetic systems can be tremendously efficient. In particular, we study exciton transport in the Fenna-Mathews-Olson (FMO) complex found in green sulphur bacteria. The exciton dynamics and energy transfer efficiency depend on the interaction of excited chromophores with their environment. Based upon realistic, site-dependent models of the system-bath coupling, we present results that suggest that this interaction may be optimized in the case of FMO. Furthermore we verify two transport pathways and note that one is dominated by coherent dynamics and the other by incoherent energy dissipation. In particular, we note a significant correlation between energy transport efficiency and coherence for exciton transfer from bacteriochlorophyll (BChl) 8 to BChl 4.
光合作用系统中的能量传递效率非常高。具体来说，我们研究了在绿硫细菌中发现的 Fenna-Mathews-Olson (FMO) 复合物中的激子传递。激子动力学和能量转移效率取决于激发态发色团与环境的相互作用。基于对系统-浴耦合的现实、基于位置的模型，我们提出的结果表明，这种相互作用在 FMO 的情况下可能会得到优化。此外，我们验证了两种传输途径，并注意到一种途径由相干动力学主导，另一种途径由非相干能量耗散主导。特别是，我们注意到从细菌叶绿素 (BChl) 8 到 BChl 4 的激子转移的能量传递效率与相干性之间存在显著相关性。
