The Effects of Band Dispersion and Interactions on the Excitation Gaps in the Periodic Anderson Model in Infinite Dimensions
The Effects of Band Dispersion and Interactions on the Excitation Gaps in the Periodic Anderson Model in Infinite Dimensions
复制标题
无限维周期性安德森模型中能带色散和相互作用对激发间隙的影响
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
A. Hewson
中科院分区：
文献类型：
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作者：
Y. Shimizu;O. Sakai;A. Hewson
研究了周期安德森模型单电子态密度（DOS）中f电子能带色散和f电子间相互作用对差距的影响.计算是基于动力学平均场理论和数值重整化群方法在无限维模型。在低能量的电子-空穴对称模型与相互作用的局部f-电子DOS被发现有一个完整的间隙，一个伪间隙或间隙少，每当这些结构发生的非相互作用的模型，但这些功能的特征参数被强烈重整化。随着f电子色散程度的增加，当存在完全能隙时，多体重整化几乎保持不变，但在赝能隙情况下，重整化增加。我们计算了在本地DOS和在动态的本地可伸缩性的差距的大小。当差距宽度由完全间隙模型的光谱中的边缘定义时，
We investigate the inter-play of f-electron band dispersion and inter-f electron interactions on the gap in the one electron density of states (DOS) of the periodic Anderson model. The calculations are based on dynamical mean field theory and the numerical renormalization group method for the model in infinite dimensions. The local f-electron DOS at low energies for the electron-hole symmetric model with interactions is found to have a complete-gap, a pseudo-gap or to be gap-less, whenever these structures occur for the non-interacting model but the parameters that characterize these features are strongly renormalized. As the degree of f-electron dispersion is increased, when there is a complete gap, the many-body renormalization remains almost constant, but in the pseudo-gap case the renormalization increases. We calculate the sizes of gaps both in the local DOS and in the dynamic local susceptibilities. When the gap width is defined by the edges in the spectrum for the complete-gap model, the widths of ...