arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.09292physics.chem-phcond-mat.mtrl-sci
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多电子区Perdew-Zunger自相互作用修正的轨道尺度下的改进

Improvements in the orbitalwise scaling down of Perdew-Zunger self-interaction correction in many-electron regions

Yoh Yamamoto, Selim Romero, Tunna Baruah, Rajendra R. Zope

摘要:

Perdew-Zunger(PZ)方法提供了一种方法,以消除自相互作用(SI)的轨道上的轨道基础上的密度泛函近似的错误。的PZ方法提供了显着的改善,如势垒高度或离解能的属性,但结果过度校正的SI-未校正的半局部功能以及描述的属性。纠正过度校正趋势的一种方法是按比例缩小多电子区域中每个轨道的SI校正的幅度。我们已经使用费米-勒夫丁SI校正方法实现了Vydrov等人[J. Chem. Phys. 124,094108(2006)]的轨道按比例缩小SI校正(OSIC)方案。在验证OSIC实现与以前报道的OSIC-LSDA结果,我们检查其性能与最成功的非经验的SCAN元GGA功能。使用不同形式的比例因子,以确定一个电子区域,我们评估的性能OSIC-SCAN的范围广泛的属性:总能量,电离势和原子,原子化能,离解和反应能,反应势垒高度的分子的电子亲合能。我们的研究结果表明,OSIC-SCAN提供了优越的结果比以前报道的OSIC-LSDA,-PBE,和-TPSS的结果。此外,我们提出了选择性标度的OSIC(SOSIC),以消除其主要的缺点,破坏了$-1/r$渐近行为的潜力。SOSIC方法给出的最高占据轨道本征值几乎与PZSIC中的那些相同,并且与OSIC不同的是,即使具有更大的缩放因子的幂,也提供束缚原子阴离子。与PZSIC或OSIC相比,SOSIC提供了对总能量和势垒高度的更平衡的描述。

英文摘要:

The Perdew-Zunger (PZ) method provides a way to remove the self-interaction (SI) error from density functional approximations on an orbital by orbital basis. The PZ method provides significant improvements for the properties such as barrier heights or dissociation energies but results in over-correcting the properties well described by SI-uncorrected semi-local functional. One cure to rectify the over-correcting tendency is to scale down the magnitude of SI-correction of each orbital in the many electron region. We have implemented the orbitalwise scaled down SI-correction (OSIC) scheme of Vydrov et al. [J. Chem. Phys. 124, 094108 (2006)] using the Fermi-Löwdin SI-correction method. After validating the OSIC implementation with previously reported OSIC-LSDA results, we examine its performance with the most successful non-empirical SCAN meta-GGA functional. Using different forms of scaling factors to identify one-electron regions, we assess the performance of OSIC-SCAN for a wide range of properties: total energies, ionization potentials and electron affinities for atoms, atomization energies, dissociation and reaction energies, and reaction barrier heights of molecules. Our results show that OSIC-SCAN provides superior results than the previously reported OSIC-LSDA, -PBE, and -TPSS results. Furthermore, we propose selective scaling of OSIC (SOSIC) to remove its major shortcoming that destroys the $-1/r$ asymptotic behavior of the potentials. The SOSIC method gives the highest occupied orbital eigenvalues practically identical to those in PZSIC and unlike OSIC provides bound atomic anions even with larger powers of scaling factors. SOSIC compared to PZSIC or OSIC provides more balanced description of total energies and barrier heights.

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