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Delocalization Effect Of The Hubbard Repulsion In Exact Terms And Two Dimensions

机译：精确和二维的哈伯斥力的离域效应

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摘要

The genuine physical reasons explaining the delocalization effect of the Hubbard repulsion U are analyzed. First, it is shown that always when this effect is observed, U acts on the background of a macroscopic degeneracy present in a multiband type of system. After this step, I demonstrate that acting in such conditions, by strongly diminishing the double occupancy, U spreads out the contributions in the ground state wave function, hence strongly increases the one-particle localization length, and consequently extends the one-particle behavior producing conditions for a delocalization effect. To be valuable, the reported results are presented in exact terms, being based on the first exact ground states deduced at half-filling in two dimensions for a prototype two band system, which is the generic periodic Anderson model at finite value of the interaction.
机译：分析了解释哈伯德排斥U的离域效应的真实物理原因。首先，表明总是观察到这种影响时，U就会作用于多频带类型系统中存在的宏观退化的背景。在此步骤之后，我证明了在这样的条件下进行操作，通过极大地减少了双重占用，U扩展了基态波函数的贡献，因此极大地增加了单粒子的定位长度，从而扩展了单粒子行为的产生离域效应的条件。有价值的是，报告的结果以精确的术语表示，基于原型两波段系统在二维半填充时推导出的第一个确切基态，这是相互作用有限值的通用周期性Anderson模型。

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