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arXiv 2108.01186physics.chem-phcond-mat.mtrl-sci
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用Fermi-Löwdin轨道实现实空间中Perdew-Zunger自相互作用修正

Implementation of Perdew-Zunger self-interaction correction in real space using Fermi-Löwdin orbitals

Carlos M. Diaz, Phanish Suryanarayana, Qimen Xu, Tunna Baruah, John Pask, Rajendra Zope

摘要:

最广泛使用的密度泛函近似遭受自相互作用(SI)误差,其可以使用Perdew-Zunger(PZ)自相互作用校正(SIC)来校正。我们实现了最近提出的PZ-SIC的规模广泛的制定使用费米-Löwdin轨道(FLOs)在真实空间中,这是服从系统收敛和大规模并行化。我们通过计算选定分子的原子化能和电离势,并与现有的基于高斯的代码中的FLOSIC实现所获得的结果进行比较,验证了广义斯莱特方案中的新制剂。结果表明,两种配方之间的良好协议,与新的真实空间的结果有点接近实验平均考虑的系统。我们还通过按比例缩小SIC势的Slater统计平均值得到了电离势和原子化能。结果表明,降低平均SIC势可以提高原子化能和电离势,使它们更接近实验。最后,我们通过计算BH 6数据集中化学反应的势垒高度来验证本公式,其中相对于基于高斯的FLOSIC结果获得了显着的改进。

英文摘要:

Most widely used density functional approximations suffer from self-interaction (SI) error, which can be corrected using the Perdew-Zunger (PZ) self-interaction correction (SIC). We implement the recently proposed size-extensive formulation of PZ-SIC using Fermi-Löwdin Orbitals (FLOs) in real space, which is amenable to systematic convergence and large-scale parallelization. We verify the new formulation within the generalized Slater scheme by computing atomization energies and ionization potentials of selected molecules and comparing to those obtained by existing FLOSIC implementations in Gaussian based codes. The results show good agreement between the two formulations, with new real-space results somewhat closer to experiment on average for the systems considered. We also obtain the ionization potentials and atomization energies by scaling down the Slater statistical average of SIC potentials. The results show that scaling down the average SIC potential improves both atomization energies and ionization potentials, bringing them closer to experiment. Finally, we verify the present formulation by calculating the barrier heights of chemical reactions in the BH6 dataset, where significant improvements are obtained relative to Gaussian based FLOSIC results.

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