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arXiv 1401.7822physics.chem-ph
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DFT强相互作用极限下的交换相关泛函:在模拟化学体系中的应用

Exchange-correlation functionals from the strongly-interacting limit of DFT: Applications to model chemical systems

Francesc Malet, Andre Mirtschink, Klaas J. H. Giesbertz, Lucas O. Wagner, Paola Gori-Giorgi

摘要:

我们研究模型一维化学系统(代表他们的三维同行)使用严格相关电子(SCE)功能,通过建设,成为渐近精确的无限耦合强度的限制。SCE泛函对密度具有高度的非局部依赖性,并且能够在Kohn-Sham理论内捕获强相关性而不引入任何对称性破缺。然而,化学系统并不足够接近强相互作用极限,因此,虽然电离能和拉伸的H2分子被准确描述,但总能量通常太低。修正的基础上,在无限耦合强度的Hohenberg-Kohn功能的扩展中的确切的下一个领先的顺序在很大程度上改善了结果。

英文摘要:

We study model one-dimensional chemical systems (representative of their three-dimensional counterparts) using the strictly-correlated electrons (SCE) functional, which, by construction, becomes asymptotically exact in the limit of infinite coupling strength. The SCE functional has a highly non-local dependence on the density and is able to capture strong correlation within Kohn- Sham theory without introducing any symmetry breaking. Chemical systems, however, are not close enough to the strong-interaction limit so that, while ionization energies and the stretched H2 molecule are accurately described, total energies are in general way too low. A correction based on the exact next leading order in the expansion at infinite coupling strength of the Hohenberg-Kohn functional largely improves the results.

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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