Nagaoka Ferromagnetism in Two-Band Hubbard Model

被引：0

作者：

张德平 ^{[1
]}

田光善 ^{[1
]}

林海青 ^{[2
]}

机构：

[1] School of Physics, Peking University

来源：

Communications in Theoretical Physics | 2015年 / 63卷 / 02期

基金：

中国国家自然科学基金;

关键词：

two-band Hubbard model; Nagaoka ferromagnetism;

D O I：

暂无

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In the present paper, we investigate the existence of ferromagnetism in a two-band Hubbard model, by applying a recently-introduced method by us to study ferromagnetism in metallic clusters. We prove rigorously that the ground state of this model is ferromagnetic if the intra-orbital Coulomb repulsion between electrons is infinitely strong and only one hole exists in the system. Our theorem improves a previous result. Furthermore, our method can also be applied to deal with the case of multiple holes.

引用

页码：261 / 270

页数：10

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