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arXiv 1908.05721physics.chem-ph
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密度泛函分析:密度校正的DFT理论

Density functional analysis: The theory of density-corrected DFT

Stefan Vuckovic, Suhwan Song, John Kozlowski, Eunji Sim, Kieron Burke

摘要:

密度校正密度泛函理论(DC-DFT)在改进半局域DFT计算中取得了巨大的成功。本文提供了形式化的理论框架和假设分析任何函数极小化的近似泛函。我们推广DC-DFT允许任何两个泛函的比较,而不仅仅是与确切的功能比较。我们在任意两个近似之间引入一个线性插值,并利用所得结果来分析全局混合密度泛函。我们定义了盆地的密度空间中,这种分析应适用,并给出定量标准时DC-DFT应适用。我们还讨论了强相关性对密度驱动误差的影响,并以限制性HF Hubbard二聚体为例。

英文摘要:

Density-corrected density functional theory (DC-DFT) is enjoying substantial success in improving semilocal DFT calculations in a wide variety of chemical problems. This paper provides the formal theoretical framework and assumptions for the analysis of any functional minimization with an approximate functional. We generalize DC-DFT to allow comparison of any two functionals, not just comparison with the exact functional. We introduce a linear interpolation between any two approximations, and use the results to analyze global hybrid density functionals. We define the basins of density-space in which this analysis should apply, and give quantitative criteria for when DC-DFT should apply. We also discuss the effects of strong correlation on density-driven error, utilizing the restricted HF Hubbard dimer as an illustrative example.

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