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arXiv 1502.00491physics.chem-phcond-mat.otherphysics.bio-ph
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光合色素间电子耦合的全量子动力学研究

Full quantum dynamics of the electronic coupling between photosynthetic pigments

María Belén Oviedo, Cristián G. Sánchez

摘要:

从研究的时间演化的单电子密度矩阵内的密度泛函紧束缚形式主义,我们研究了在一个完全原子的图片中的电子激发两个光合色素之间的实时转移。这种依赖于时间的量子动力学是基于光合色素的完全原子结构模型。我们分析了电子激发传递与光合色素之间的距离和方向的依赖关系。我们比较了从全量子动力学分析的基础上,两个层次的系统模型的颜料之间的相互作用是偶极的结果。我们观察到,即使当光合色素的距离约为$30$/cm时,偶极的偏差约为$15$ %。

英文摘要:

From studying the time evolution of the single electron density matrix within a density functional tight-binding formalism we study in a fully atomistic picture the electronic excitation transfer between two photosynthetic pigments in real time. This time-dependent quantum dynamics is based on fully atomistic structural models of the photosynthetic pigment. We analyze the dependence of the electronic excitation transfer with distance and orientation between photosynthetic pigments. We compare the results obtained from full quantum dynamics with analytical ones, based on a two level system model were the interaction between the pigments is dipolar. We observed that even when the distance of the photosynthetic pigment is about $30$ Å the deviation of the dipolarity is of about $15$ percent.

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