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arXiv 1503.07059physics.chem-ph
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FMO复合物的显式关联激子-振动动力学

Explicit Correlated Exciton-Vibrational Dynamics of the FMO Complex

Jan Schulze, Oliver Kühn

摘要:

利用数值精确多层多组态含时Hartree方法研究了三格点FMO模型的激子-振动耦合动力学。因此,从离散化的实验谱密度调整到局部电子跃迁的振动模式特定耦合。由此产生的含时薛定谔方程,包括3个电子和450个振动自由度的激子布居和相干分析的解决方案。重点放在特定范围的振动频率的作用。据观察,模式之间的160和300厘米$^{-1}$是负责亚皮秒人口和相干衰减。此外,发现相对于振动自由度的平均场方法是不适用的。

英文摘要:

The coupled exciton-vibrational dynamics of a 3-site FMO model is investigated using the numerically exact multilayer multiconfiguration time-dependent Hartree approach. Thereby the vibrational mode specific coupling to local electronic transitions is adapted from a discretized experimental spectral density. The solution of the resulting time-dependent Schrödinger equation including three electronic and 450 vibrational degrees of freedom is analyzed in terms of excitonic populations and coherences. Emphasis is put onto the role of specific ranges of vibrational frequencies. It is observed that modes between 160 and 300 cm$^{-1}$ are responsible for the subpicosecond population and coherence decay. Further, it is found that a mean-field approach with respect to the vibrational degrees of freedom is not applicable.

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