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arXiv 1003.3681cond-mat.mtrl-sci
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密度泛函理论中的定域与扩展系统:来自Kohn-Sham精确交换势的一些教训

Localized versus extended systems in density-functional theory: some lessons from the Kohn-Sham exact exchange potential

C. M. Horowitz, C. R. Proetto, J. M. Pitarke

摘要:

在密度泛函理论中,一个长期存在的难题是金属表面的Kohn-Sham交换关联势的长程行为问题。作为求解的重要一步,本文通过对优化有效势积分方程的Rigurouos渐近分析和精确数值解,证明了Kohn-Sham精确交换势随$\ln(z)/z$衰减到{ \it extended}半无限大的真空侧。与{ \it定域}系统(如原子、分子和平板)中的情况相反,这种主要贡献不是由所谓的斯莱特势产生的。这个确切的交换结果提供了一个强有力的约束近似相关能量泛函的适用性。

英文摘要:

A long-standing puzzle in density-functional theory is the issue of the long-range behavior of the Kohn-Sham exchange-correlation potential at metal surfaces. As an important step towards its solution, it is proved here, through a rigurouos asymptotic analysis and accurate numerical solution of the Optimized-Effective-Potential integral equation, that the Kohn-Sham exact exchange potential decays as $\ln(z)/z$ far into the vacuum side of an {\it extended} semi-infinite jellium. In contrast to the situation in {\it localized} systems, like atoms, molecules, and slabs, this dominant contribution does not arise from the so-called Slater potential. This exact-exchange result provides a strong constraint on the suitability of approximate correlation-energy functionals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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