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arXiv 1807.05481cond-mat.mtrl-sciphysics.chem-ph
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非线性金属屏蔽中的顶密度及其对交换关联能泛函的意义

On-Top Density in the Nonlinear Metallic Screening and its Implication on the Exchange-Correlation Energy Functional

Yasutami Takada

摘要:

与扩散蒙特卡罗(DMC)模拟得到的密度参数r_s在1-12范围内的质子嵌入电子气顶电子密度n(0)的精确数据相比,我们成功地构造了密度泛函理论中交换相关能泛函的另一种形式,通过对著名的Perdew-Burke-Ernzerhof(PBE)功能。虽然PBE不能,我们的泛函,称为尖点校正PBE(ccPBE),再现DMC数据在n(0)在整个范围内的r_s。

英文摘要:

In comparison with the accurate data on the on-top electron density n(0) in the proton-embedded electron gas with the density parameter r_s in the range 1-12 obtained by diffusion Monte Carlo (DMC) simulations, we have successfully constructed an alternative form of the exchange-correlation energy functional in the density functional theory by imposing the constraint due to the cusp theorem on the well-known Perdew-Burke-Ernzerhof (PBE) functional. Although PBE does not, our functional, referred to as the cusp-corrected PBE (ccPBE), reproduces the DMC data on n(0) in the entire range of r_s.

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