Valence Fluctuations and Electric Reconstruction in the Extended Anderson Model on the Two-Dimensional Penrose Lattice
Valence Fluctuations and Electric Reconstruction in the Extended Anderson Model on the Two-Dimensional Penrose Lattice
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二维彭罗斯晶格扩展安德森模型中的价态涨落和电重建
DOI：
10.1103/physrevb.91.165114
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发表时间：
2015
影响因子：
3.7
通讯作者：
and A. Koga
中科院分区：
文献类型：
--
作者：
S. Takemura;N. Takemori;and A. Koga
将实空间动力学平均场理论与非交叉近似相结合，研究了二维Penrose格上的扩展Anderson模型。发现局域电子和传导电子之间的库仑斥力不会引起价跃迁，但近道价态和混合价态之间的交叉与传统的周期系统相反。在靠近交点的混合价区，出现了具有彭罗斯晶格特征的非平凡价态分布，表明混合价态在某些位置与局部近藤态共存。本文还讨论了混合价区的电重构。
We study the extended Anderson model on the two-dimensional Penrose lattice, combining the real-space dynamical mean-field theory with the noncrossing approximation. It is found that the Coulomb repulsion between localized and conduction electrons does not induce a valence transition, but the crossover between the Kondo and mixed valence states is in contrast to the conventional periodic system. In the mixed-valence region close to the crossover, nontrivial valence distributions appear, characteristic of the Penrose lattice, demonstrating that the mixed-valence state coexists with local Kondo states in certain sites. The electric reconstruction in the mixed valence region is also addressed.