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arXiv 1902.09086physics.chem-phcond-mat.othermath-phmath.MP
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具有顺磁流的Kohn-Sham理论:相容性和泛函可微性

Kohn-Sham theory with paramagnetic currents: compatibility and functional differentiability

Andre Laestadius, Erik I. Tellgren, Markus Penz, Michael Ruggenthaler, Simen Kvaal, Trygve Helgaker

摘要:

最近的工作已经建立了Moreau-Yosida正则化作为一种数学工具,以实现严格的功能可微的密度泛函理论。在这篇文章中,我们将这个工具扩展到顺磁电流-密度泛函理论,这是磁场效应最常见的密度泛函框架。该扩展包括一个定义良好的Kohn-Sham迭代方案与部分收敛结果。为此,我们依赖于自反和严格凸函数空间的Moreau-Yosida正则化公式。顺磁电流密度$L^1\cap L^{3/2}$的最佳$L^p$表征是从$N$可表示性条件导出的。指出并分析了顺磁电流-密度泛函理论的凸公式的一个重要前提,即粒子密度和电流密度的函数空间的相容性。给出了相容函数空间的几个结果,包括它们的递归构造。正则化,精确的泛函计算数值的Kohn-Sham迭代量子环上,说明他们的性能不同的正则化参数。

英文摘要:

Recent work has established Moreau-Yosida regularization as a mathematical tool to achieve rigorous functional differentiability in density-functional theory. In this article, we extend this tool to paramagnetic current-density-functional theory, the most common density-functional framework for magnetic field effects. The extension includes a well-defined Kohn-Sham iteration scheme with a partial convergence result. To this end, we rely on a formulation of Moreau-Yosida regularization for reflexive and strictly convex function spaces. The optimal $L^p$-characterization of the paramagnetic current density $L^1\cap L^{3/2}$ is derived from the $N$-representability conditions. A crucial prerequisite for the convex formulation of paramagnetic current-density-functional theory, termed compatibility between function spaces for the particle density and the current density, is pointed out and analyzed. Several results about compatible function spaces are given, including their recursive construction. The regularized, exact functionals are calculated numerically for a Kohn-Sham iteration on a quantum ring, illustrating their performance for different regularization parameters.

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