Interplay between coherence and decoherence in LHCII photosynthetic complex
Interplay between coherence and decoherence in LHCII photosynthetic complex
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LHCII 光合复合体中相干与退相干之间的相互作用
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
S. Lloyd
中科院分区：
文献类型：
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作者：
P. Giorda;S. Garnerone;P. Zanardi;S. Lloyd
本文研究了光复合物 LHCII（绿色植物光合作用装置的主要组成部分）中激子传输的动力学。动力学表现出由激子哈密顿量介导的相干过程和由于与环境相互作用而导致的非相干过程之间的强烈相互作用。激子在单个单体上的扩散可以通过适当的离域测量来很好地描述，该离域测量允许人们识别两个相关的时间尺度。最初位于一个发色团中的激子首先一致地扩散到邻近的发色团。在最初的相干扩散过程中，纠缠等量子效应发挥了作用。随着退相干环境的影响发挥作用，相干和退相干相互作用，产生高效且强大的激子传输，在生理条件下的退相干水平上达到最大效率。我们分析了不同可能拓扑（单体、二聚体、三聚体、四聚体）的效率，并展示了三聚体如何在天线和导线配置中发挥特殊作用。
This paper investigates the dynamics of excitonic transport in photocomplex LHCII, the primary component of the photosynthetic apparatus in green plants. The dynamics exhibits a strong interplay between coherent processes mediated by the excitonic Hamiltonian, and incoherent processes due to interactions with the environment. The spreading of the exciton over a single monomer is well described by a proper measure of delocalization that allows one to identify two relevant time scales. An exciton initially localized in one chromophore first spreads coherently to neighboring chromophores. During this initial coherent spreading, quantum effects such as entanglement play a role. As the effects of a decohering environment come into play, coherence and decoherence interact to give rise to efficient and robust excitonic transport, reaching a maximum efficiency at the levels of decoherence found in physiological conditions. We analyze the efficiency for different possible topologies (monomer, dimer, trimer, tetramer) and show how the trimer has a particular role both in the antenna and the wire configuration.