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Charge transfer excitations from exact and approximate ensemble Kohn-Sham theory

机译:从精确和近似集合Kohn-Sham理论的电荷转移激发

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摘要

By studying the lowest excitations of an exactly solvable one-dimensional soft-Coulomb molecular model, we show that components of Kohn-Sham ensembles can be used to describe charge transfer processes. Furthermore, we compute the approximate excitation energies obtained by using the exact ensemble densities in the recently formulated ensemble Hartree-exchange theory [T. Gould and S. Pittalis, Phys. Rev. Lett. 119, 243001 (2017)]. Remarkably, our results show that triplet excitations are accurately reproduced across a dissociation curve in all cases tested, even in systems where ground state energies are poor due to strong static correlations. Singlet excitations exhibit larger deviations from exact results but are still reproduced semi-quantitatively. Published by AIP Publishing.
机译:通过研究恰好可溶性一维软豆间分子模型的最低激发,我们表明Kohn-Shamelemble的组件可用于描述电荷转移过程。 此外,我们计算通过使用最近配制的集合Hartree交换理论中的精确集合密度获得的近似激励能量[ 古尔德和帕特拉底,物理。 rev. lett。 119,243001(2017)]。 值得注意的是,我们的结果表明,在所有测试的案例中,即使在接地状态较差的静态相关性的系统中,也可以在所有情况下精确地再现三重激发。 单线术激发表现出与精确结果的更大偏差,但仍然是半定量复制的。 通过AIP发布发布。

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