Ferromagnetism in the Hubbard model on a lattice of three coupled chains

被引：3

作者：

Ueda, H ^{[1
]}

Tanaka, A ^{[1
]}

Idogaki, T ^{[1
]}

机构：

[1] Kyushu Univ, Dept Appl Quantum Phys, Fukuoka 8128581, Japan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2004年 / 272卷

关键词：

Hubbard model; nearly flat band; ferromagnetism; ground state;

D O I：

10.1016/j.jmmm.2003.12.1142

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the Hubbard model which is reduced to Mielke's flat-band model on the line graph of the two-leg ladder in a special case. In the flat-band case, the model exhibits saturated ferromagnetism when the electron number corresponds to 1/6-filling + 1. We show that, even in the non-flat-band case, the model with that number of electrons exhibits ferromagnetism when the on-site interaction is large, and that this is true for 1/6-filling. We also give numerical evidence that the model with the nearly flat-band exhibits ferromagnetism for less than 1/6-filling. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：950 / 951

页数：2

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