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Linear-scaling self-consistent implementation of the van der Waals density functional

机译:Van der Waals密度泛函的线性缩放自洽实现

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An efficient linear-scaling approach to the van der Waals density functional in electronic-structure calculations is demonstrated. The nonlocal correlation potential needed in self-consistent calculations is derived in a practical form. This enables also an efficient determination of the Hellmann-Feynman forces on atoms. The numerical implementation employs adaptive quadrature grids in real space resulting in a fast and an accurate evaluation of the functional and the potential. The approach is incorporated in the atomic orbital code siesta. The application of the method to the S22 set of noncovalently bonded molecules and comparison with the quantum chemistry data reveal an overall agreement but show that different exchange functionals should be used for different types of bonds.
机译:在电子结构计算中,对范德华密度泛函的有效线性缩放方法进行了演示。自洽计算中需要的非局部相关势以实际形式导出。这也使得能够有效地确定原子上的赫尔曼-费曼力。该数字实现在实际空间中采用自适应正交网格,从而可以快速,准确地评估功能和潜力。该方法被并入原子轨道午睡。该方法在S22组非共价键分子上的应用以及与量子化学数据的比较揭示了一个总体共识,但表明对于不同类型的键应使用不同的交换功能。

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