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arXiv 1602.07161cond-mat.str-el
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Falicov-Kimball模型的非局部相关和谱性质

Nonlocal correlations and spectral properties of the Falicov-Kimball model

T. Ribic, G. Rohringer, K. Held

摘要:

我们推导出Falicov-Kimball模型局部两粒子顶点的解析表达式,包括它对所有三个频率、完整顶点和所有可约顶点的依赖性。这使我们能够在动力学平均场论的图形扩展中计算自能,特别是在对偶费米子和单粒子不可约方法中。因此,非局部相关性被包括在内,并且起源于电荷密度波波动。在低温和二维情况下,它们导致在低频下更大的自能量贡献和更绝缘的光谱。

英文摘要:

We derive an analytical expression for the local two-particle vertex of the Falicov-Kimball model, including its dependence on all three frequencies, the full vertex and all reducible vertices. This allows us to calculate the self energy in diagrammatic extensions of dynamical mean field theory, specifically in the dual fermion and the one-particle irreducible approach. Non-local correlations are thence included and originate here from charge density wave fluctuations. At low temperatures and in two dimensions, they lead to a larger self energy contribution at low frequencies and a more insulating spectrum.

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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