论文标题
扩展的星形图作为轻度收获 - 复合原型：外围能量缺陷调整的激子吸收速度
The extended star graph as a light-harvesting-complex prototype: excitonic absorption speedup by peripheral energy defect tuning
论文作者
论文摘要
我们研究了在扩展星网络的周围（带有$ n_b $ length $ l_b $）均匀分布的照片兴奋的量子动力学。更具体地说，我们在这里解决了网络核心的能量吸收问题，以及如何通过包含可调能量振幅$δ$的外围缺陷来改善（或不）。我们的数值模拟揭示了依赖网络体系结构的能量缺陷$δ$的最佳值。围绕此值，如果$ l_b \ leq l_b^* $带有$ l_b^* \大约12.5/\ ln（n_b）$，则吸收过程提出了强大的加速（即减少吸收时间）。然后进行分析/数值发展以解释此功能。我们表明，这种加速的起源发生在两个上带激发型本特征的杂交中。当$ l_b \ leq l_b^*$并在$ l_b> l_b^*$时几乎完全消失时，这种杂交很重要。我们在这里绘制的这些结构规则可以代表一个潜在的指南，用于用于实现有效的光兴吸收的分子纳米网络实践设计。
We study the quantum dynamics of a photo-excitation uniformly distributed at the periphery of an extended star network (with $N_B$ branches of length $L_B$). More specifically, we address here the question of the energy absorption at the core of the network and how this process can be improved (or not) by the inclusion of peripheral defects with a tunable energy amplitude $Δ$. Our numerical simulations reveal the existence of optimal value of energy defect $Δ^*$ which depends on the network architecture. Around this value, the absorption process presents a strong speedup (i.e. reduction of the absorption time) provided that $L_B \leq L_B^*$ with $L_B^* \approx 12.5/\ln(N_B) $. Analytical/numerical developments are then conducted to interpret this feature. We show that the origin of this speedup takes place in the hybridization of two upper-band excitonic eigenstates. This hybridization is important when $L_B \leq L_B^*$ and vanishes almost totally when $L_B > L_B^*$. These structural rules we draw here could represent a potential guide for the practical design of molecular nano-network dedicated to the realisation of efficient photo-excitation absorption.
