arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1902.10583cond-mat.mtrl-sciphysics.chem-phphysics.comp-ph
收藏

大系统激子耦合计算的实时传播TDDFT和密度分析

Real-Time Propagation TDDFT and Density Analysis for Exciton Couplings Calculations in Large Systems

Joaquim Jornet-Somoza, Irina Lebedeva

摘要:

光活性体系具有吸收和转化光能的能力,在复杂系统中,光的吸收和激发传递过程通常涉及一个以上的生色团。线性响应时间依赖密度泛函(LR-TDDFT)通常用于通过求解著名的Casida单分子方程来确定激发能和跃迁性质。然而,当处理多发色团系统时,这种方法在实践中是没有用的。在这项工作中,我们扩展我们的局部密度分解方法,使解开个人的贡献到吸收光谱的激子动力学性质的计算,如激子耦合参数。基于线性响应定理,我们推导出了实时传播时域离散傅里叶变换(P-TDDFT)的跃迁密度的解析表达式。我们证明了我们的方法的有效性,以确定过渡偶极矩,过渡密度和激子耦合系统的日益复杂。我们从孤立的苯甲醛分子,进行距离分析的$π$堆叠的二聚体,最后映射的激子耦合的14苯甲醛集群。

英文摘要:

Photo-active systems are characterized by their capacity of absorbing light energy and transforming it. Usually, more than one chromophore is involved in the light absorption and excitation transport processes in complex systems. Linear-Response Time-Dependent Density Functional (LR-TDDFT) is commonly used to identify excitation energies and transition properties by solving well-known Casida's equation for single molecules. However, this methodology is not useful in practice when dealing with multichromophore systems. In this work, we extend our local density decomposition method that enables to disentangle individual contributions into the absorption spectrum to computation of exciton dynamic properties, such as exciton coupling parameters. We derive an analytical expression for the transition density from Real-Time Propagation TDDFT (P-TDDFT) based on Linear Response theorems. We demonstrate the validity of our method to determine transition dipole moments, transition densities and exciton coupling for systems of increasing complexity. We start from the isolated benzaldehyde molecule, perform a distance analysis for $π$-stacked dimers and finally map the exciton coupling for a 14 benzaldehyde cluster.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑