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arXiv 0705.1587cond-mat.str-elcond-mat.mtrl-scimath-phmath.MP
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密度矩阵-泛函理论中的Mueller交换关联能

Mueller's Exchange-Correlation Energy in Density-Matrix-Functional Theory

Rupert L. Frank, Elliott H. Lieb, Robert Seiringer, Heinz Siedentop

摘要:

随着人们对Mueller密度矩阵泛函理论的兴趣日益浓厚,我们对其性质进行了系统的数学研究。该泛函类似于Hartree-Fock泛函,但具有修改的交换项,其中密度矩阵γ(X,X ')的平方被γ^{1/2}(X,X')的平方代替。在对密度矩阵泛函理论进行了广泛的介绍性讨论之后,我们证明了该泛函是凸的(与HF泛函不同),并且能量最小化γ具有唯一的密度ρ(x),这是HF理论中经常缺少的物理理想性质。证明了极小元存在的充要条件是N \leq Z,并给出了极小能量和极小元的各种性质.我们还给出了γ轨道方程的精确描述,它比HF理论的更复杂。我们陈述了关于该理论的一些开放的数学问题,并给出了解答。

英文摘要:

The increasing interest in the Mueller density-matrix-functional theory has led us to a systematic mathematical investigation of its properties. This functional is similar to the Hartree-Fock functional, but with a modified exchange term in which the square of the density matrix γ(X, X') is replaced by the square of γ^{1/2}(X, X'). After an extensive introductory discussion of density-matrix-functional theory we show, among other things, that this functional is convex (unlike the HF functional) and that energy minimizing γ's have unique densities ρ(x), which is a physically desirable property often absent in HF theory. We show that minimizers exist if N \leq Z, and derive various properties of the minimal energy and the corresponding minimizers. We also give a precise statement about the equation for the orbitals of γ, which is more complex than for HF theory. We state some open mathematical questions about the theory together with conjectured solutions.

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