越来越大的分子的参考激发能：花菁染料的QMC研究
Reference excitation energies of increasingly large molecules: a QMC study of cyanine dyes
摘要：
在这里，我们重新审视最低的垂直激发的菁染料使用量子蒙特卡罗和利用最近的发展，系统地改善以前的结果。特别是，我们采用了一个协议，紧凑和准确的多行列式贾斯特罗-斯莱特波函数的多个状态，我们最近验证了几个小的原型分子的激发态特性的建设。在这里，我们得到的量子Monte Carlo激发能在良好的协议与高层次的耦合集群的所有花菁的耦合集群方法是适用的。此外，我们将我们的协议推向更长的链，证明量子蒙特卡罗是一种可行的方法，可以在系统大小上建立参考数据，这是其他类似精度的高端方法难以达到的。最后，我们确定哪些成分是准确治疗这些具有挑战性的系统的关键，并合理解释为什么仅基于活性$π$轨道的激发描述缺乏所需的准确性较短的链。
英文摘要：
We revisit here the lowest vertical excitations of cyanine dyes using quantum Monte Carlo and leverage on recent developments to systematically improve on previous results. In particular, we employ a protocol for the construction of compact and accurate multi-determinant Jastrow-Slater wave functions for multiple states, which we have recently validated on the excited-state properties of several small prototypical molecules. Here, we obtain quantum Monte Carlo excitation energies in excellent agreement with high-level coupled cluster for all the cyanines where the coupled cluster method is applicable. Furthermore, we push our protocol to longer chains, demonstrating that quantum Monte Carlo is a viable methodology to establish reference data at system sizes which are hard to reach with other high-end approaches of similar accuracy. Finally, we determine which ingredients are key to an accurate treatment of these challenging systems and rationalize why a description of the excitation based on only active $π$ orbitals lacks the desired accuracy for the shorter chains.
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