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arXiv 1107.4377cond-mat.str-elcond-mat.mtrl-sci
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强关联电子简单模型中精确Kohn-Sham本征态与准粒子

Exact Kohn-Sham eigenstates versus quasiparticles in simple models of strongly correlated electrons

D. J. Carrascal, J. Ferrer

摘要:

我们给出了相关电子简单紧束缚模型的精确密度泛函和Kohn-Sham Hamilton的解析表达式。这些是安德森、哈伯德和无自旋费米子模型的单、双场点版本。交换势和关联势是完全非定域的。解析表达式允许比较精确的密度泛函理论的Kohn-Sham本征态与这些关联电子系统的多体准粒子态。精确的Kohn-Sham谱正确地描述了多体准粒子谱的许多非平凡特征,例如近藤峰的前体。然而,我们发现,一些准粒子谱丢失,因为电子和空穴激发的多体相空间是丰富的。

英文摘要:

We present analytic expressions for the exact density functional and Kohn-Sham Hamiltonian of simple tight-binding models of correlated electrons. These are the single- and double-site versions of the Anderson, Hubbard and spinless fermion models. The exact exchange and correlation potentials are fully non-local. The analytic expressions allow to compare the Kohn-Sham eigenstates of exact density functional theory with the many-body quasi-particle states of these correlated-electron systems. The exact Kohn-Sham spectrum describes correctly many of the non-trivial features of the many-body quasi-particle spectrum, as for example the precursors of the Kondo peak. However, we find that some pieces of the quasi-particle spectrum are missing because the many-body phase-space for electron and hole excitations is richer.

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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