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arXiv 1012.5823physics.chem-phphysics.comp-ph
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双杂化密度泛函理论的严谨性

Double-hybrid density-functional theory made rigorous

Kamal Sharkas, Julien Toulouse, Andreas Savin

摘要:

我们提供了一个严格的推导一类双杂交近似,结合Hartree-Fock交换和二阶Moller-Plesset相关与半局部交换相关密度泛函。这些双混合近似只包含一个经验参数,并使用密度缩放相关能量功能。忽略密度标度会导致标准双杂交近似的单参数版本。我们评估这些双混合动力方案的雾化能量和反应势垒高度的代表性测试集的性能,我们比较其他混合动力近似,包括范围分离的混合动力。我们最好的单参数双杂交近似,称为1DH-BLYP,粗略地再现了标准B2-PLYP或B2 GP-PLYP双杂交近似的两个参数,这表明这些方法不仅在经验上接近于一般化学应用的最佳值,而且在理论上也得到了支持。

英文摘要:

We provide a rigorous derivation of a class of double-hybrid approximations, combining Hartree-Fock exchange and second-order Moller-Plesset correlation with a semilocal exchange-correlation density functional. These double-hybrid approximations contain only one empirical parameter and use a density-scaled correlation energy functional. Neglecting density scaling leads to a one-parameter version of the standard double-hybrid approximations. We assess the performance of these double-hybrid schemes on representative test sets of atomization energies and reaction barrier heights, and we compare to other hybrid approximations, including range-separated hybrids. Our best one-parameter double-hybrid approximation, called 1DH-BLYP, roughly reproduces the two parameters of the standard B2-PLYP or B2GP-PLYP double-hybrid approximations, which shows that these methods are not only empirically close to an optimum for general chemical applications but are also theoretically supported.

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