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arXiv 0902.2306cond-mat.mtrl-sci
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全电子密度泛函理论和含时密度泛函理论的高阶有限元

All-electron density functional theory and time-dependent density functional theory with high-order finite elements

Lauri Lehtovaara, Ville Havu, Martti Puska

摘要:

我们提出了静态密度泛函理论和含时密度泛函理论计算的全电子方法,采用高阶层次有限元基地。我们的网格生成方案,其中结构化的原子网格合并到一个非结构化的分子网格,允许高度不均匀的空间离散化。因此,可以使用相同的离散化方案来表示核心和价态,即,不需要赝势或类似的处理。非均匀离散化还允许使用大的模拟单元,因此避免了任何边界效应。

英文摘要:

We present for static density functional theory and time-dependent density functional theory calculations an all-electron method which employs high-order hierarchical finite element bases. Our mesh generation scheme, in which structured atomic meshes are merged to an unstructured molecular mesh, allows a highly nonuniform discretization of the space. Thus it is possible to represent the core and valence states using the same discretization scheme, i.e., no pseudopotentials or similar treatments are required. The nonuniform discretization also allows the use of large simulation cells, and therefore avoids any boundary effects.

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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