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arXiv physics/0410062physics.chem-phphysics.atom-ph
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密度泛函理论中电子-电子相互作用的长程/短程分离

Long-range/short-range separation of the electron-electron interaction in density functional theory

Julien Toulouse, Francois Colonna, Andreas Savin

摘要:

通过将库仑相互作用分解为长程和短程分量,我们将量子电子系统的能量分解为长程和短程贡献。我们表明,长范围的能量可以有效地计算传统的波函数方法,而短范围的部分可以处理的密度泛函。该功能相对于相关的相互作用的范围的分析表明,在一个非常短的距离相互作用的限制,短程交换相关能量可以表示为一个简单的本地功能的顶部对密度及其一阶导数。这为短程泛函的局域密度近似(LDA)的准确性提供了解释。此外,这种分析也导致新的简单近似的短程交换和相关能量提高LDA。

英文摘要:

By splitting the Coulomb interaction into long-range and short-range components, we decompose the energy of a quantum electronic system into long-range and short-range contributions. We show that the long-range part of the energy can be efficiently calculated by traditional wave function methods, while the short-range part can be handled by a density functional. The analysis of this functional with respect to the range of the associated interaction reveals that, in the limit of a very short-range interaction, the short-range exchange-correlation energy can be expressed as a simple local functional of the on-top pair density and its first derivatives. This provides an explanation for the accuracy of the local density approximation (LDA) for the short-range functional. Moreover, this analysis leads also to new simple approximations for the short-range exchange and correlation energies improving the LDA.

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