Modelling of oscillations in two-dimensional echo-spectra of the Fenna-Matthews-Olson complex
Modelling of oscillations in two-dimensional echo-spectra of the Fenna-Matthews-Olson complex
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DOI：
10.1088/1367-2630/14/2/023018
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发表时间：
2012-02-07
影响因子：
3.3
通讯作者：
Rodriguez, Mirta
中科院分区：
文献类型：
--
作者：
Hein, Birgit;Kreisbeck, Christoph;Rodriguez, Mirta
最近的实验观察的时间依赖性殴打在二维回波光谱的捕光复合物在环境温度下已经打开了一个问题，是否相干性和类波行为在光合作用中发挥了重要作用。我们进行了数值研究的吸收和回波光谱的Fenna-Matthews-Olson（FMO）复杂的Chlorobium tepidum和分析的要求，在理论模型中需要再现拍在计算的光谱。FMO色素蛋白质复合物中的能量转移理论上由耦合到声子浴的激子哈密顿量描述，该声子浴分别占色素的电子和振动激发。我们使用分层运动方程方法来处理强耦合的非微扰方式。我们表明，在二维回波谱的振荡坚持存在的热噪声和静态无序。
Recent experimental observations of time-dependent beatings in the two-dimensional echo-spectra of light-harvesting complexes at ambient temperatures have opened up the question of whether coherence and wave-like behaviour play a significant role in photosynthesis. We carry out a numerical study of the absorption and echo-spectra of the Fenna-Matthews-Olson (FMO) complex in Chlorobium tepidum and analyse the requirements in the theoretical model needed to reproduce beatings in the calculated spectra. The energy transfer in the FMO pigment-protein complex is theoretically described by an exciton Hamiltonian coupled to a phonon bath which accounts for the pigments' electronic and vibrational excitations, respectively. We use the hierarchical equations of motions method to treat the strong couplings in a non-perturbative way. We show that the oscillations in the two-dimensional echo-spectra persist in the presence of thermal noise and static disorder.