Nagaoka Ferromagnetism in Two-Band Hubbard Model

被引：1

作者：

Zhang De-Ping ^{[1
]}

Tian Guang-Shan ^{[1
]}

Lin Hai-Qing ^{[2
]}

机构：

[1] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[2] Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China

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; ORBITAL DEGENERACY; BAND; NARROW; STATE; STABILITY; THEOREM;

D O I：

10.1088/0253-6102/63/2/21

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 aprevious 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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