Van der Waals密度泛函：一个合适的交换泛函
Van der Waals density functional: an appropriate exchange functional
摘要：
本文提出了一种与非定域Rutgers-Chalmers关联泛函相容的交换泛函（vdw-DF）。当与vdw-DF一起使用时，该泛函表现出对分子间分离距离的显着改善，同时进一步提高了vdw-DF相互作用能的准确性。这三个参数的功能的成功的关键是其减少短程交换排斥通过匹配的梯度交换近似在缓慢变化/高密度的限制，同时恢复大的减少梯度，s，限制设置在修改后的PBE交换功能。这种增强的交换功能可能是一个长期存在的问题vdw-DF贷款进一步适用于密度泛函理论的研究相对较大的，分散约束（范德华）复合物的解决方案。
英文摘要：
In this paper, an exchange functional which is compatible with the non-local Rutgers-Chalmers correlation functional (vdW-DF) is presented. This functional, when employed with vdW-DF, demonstrates remarkable improvements on intermolecular separation distances while further improving the accuracy of vdW-DF interaction energies. The key to the success of this three parameter functional is its reduction of short range exchange repulsion through matching to the gradient exchange approximation in the slowly varying/high density limit while recovering the large reduced gradient, s, limit set in the revised PBE exchange functional. This augmented exchange functional could be a solution to long-standing issues of vdW-DF lending to further applicability of density functional theory to the study of relatively large, dispersion bound (van der Waals) complexes.
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