arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1004.4813cond-mat.mtrl-sciphysics.comp-ph
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使用非正交广义Wannier函数的投影自洽DFT +U

Projector self-consistent DFT+U using non-orthogonal generalized Wannier functions

David D. O'Regan, Nicholas D. M. Hine, Mike C. Payne, Arash A. Mostofi

摘要:

我们提出了一个配方的密度泛函理论+哈伯德模型(DFT+U)的方法,是自洽的哈伯德投影用于定义相关子空间的选择。为了克服这种选择的任意性,我们提出使用非正交广义Wannier函数(NGWFs)作为DFT+U校正的投影仪。我们迭代地改进这些NGWF投影,从而改进DFT+U泛函,使得相关子空间与DFT+U基态完全自洽。我们讨论了该算法的收敛特性,并比较基态的性质,从而计算与使用类氢投影仪计算。我们的方法是在,但不限于,线性尺度DFT框架内实现的,开辟了DFT+U计算前所未有的规模的系统的路径。

英文摘要:

We present a formulation of the density-functional theory + Hubbard model (DFT+U) method that is self-consistent over the choice of Hubbard projectors used to define the correlated subspaces. In order to overcome the arbitrariness in this choice, we propose the use of non-orthogonal generalized Wannier functions (NGWFs) as projectors for the DFT+U correction. We iteratively refine these NGWF projectors and, hence, the DFT+U functional, such that the correlated subspaces are fully self-consistent with the DFT+U ground-state. We discuss the convergence characteristics of this algorithm and compare ground-state properties thus computed with those calculated using hydrogenic projectors. Our approach is implemented within, but not restricted to, a linear-scaling DFT framework, opening the path to DFT+U calculations on systems of unprecedented size.

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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