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arXiv 1807.09216cond-mat.mtrl-sci
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固体中的脱轨道meta-GGA交换关联泛函

Deorbitalized meta-GGA Exchange-Correlation Functionals in Solids

Daniel Mejia-Rodriguez, S. B. Trickey

摘要:

最近,我们提出了一种从广义梯度近似(mGGA)交换相关泛函中去除显式轨道依赖的方法,将其转化为Laplacian依赖泛函,并在分子中得到了成功的应用。它使用一个近似的动能密度泛函(KEDF)参数化Kohn-Sham的结果(不是实验数据)在一个小的训练集。在这里,我们提出了广泛的验证计算周期性的固体,证明了相同的参数化,同样的脱轨也是成功的扩展系统。由于在其建设中使用的严格的限制和它最近的突出,我们的重点是在扫描元GGA。编码在\textsc{vasp}中的去轨道版本SCAN-L可以比原来的SCAN快三倍,这对于大规模从头算分子动力学来说是一个潜在的重大收获。

英文摘要:

A procedure for removing explicit orbital dependence from meta-generalized-gradient approximation (mGGA) exchange-correlation functionals by converting them into Laplacian-dependent functionals recently was developed by us and shown to be successful in molecules. It uses an approximate kinetic energy density functional (KEDF) parametrized to Kohn-Sham results (not experimental data) on a small training set. Here we present extensive validation calculations on periodic solids that demonstrate that the same deorbitalization with the same parametrization also is successful for those extended systems. Because of the number of stringent constraints used in its construction and its recent prominence, our focus is on the SCAN meta-GGA. Coded in \textsc{vasp}, the deorbitalized version, SCAN-L, can be as much as a factor of three faster than original SCAN, a potentially significant gain for large-scale ab initio molecular dynamics.

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