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arXiv 0709.0913cond-mat.str-el
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非对称Anderson模型中的Kondo行为:解析方法

Kondo behavior in the asymmetric Anderson model: Analytic approach

V Janis, P. Augustinsky

摘要:

本文用图解法研究了非对称单杂质Anderson模型的低温行为,得到了解析可控近似。我们首先讨论的方法,可以简化镶木地板方程的奇异性在两个粒子的顶点的临界区域。在临界点处消失的尺度定义了近藤温度,在该温度下电子-空穴关联函数饱和。我们证明了近藤温度存在于杂质能级的任何填充处。然而,在光谱函数中的准粒子共振峰仅在几乎电子-空穴对称的情况下形成。我们将近藤温度与共振峰的宽度联系起来。最后讨论了谱函数中卫星Hubbard带的存在性。

英文摘要:

The low-temperature behavior of the asymmetric single-impurity Anderson model is studied by diagrammatic methods resulting in analytically controllable approximations. We first discuss the ways one can simplify parquet equations in critical regions of singularities in the two-particle vertex. The scale vanishing at the critical point defines the Kondo temperature at which the electron-hole correlation function saturates. We show that the Kondo temperature exists at any filling of the impurity level. A quasiparticle resonance peak in the spectral function, however, forms only in almost electron-hole symmetric situations. We relate the Kondo temperature with the width of the resonance peak. Finally we discuss the existence of satellite Hubbard bands in the spectral function.

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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