Metallic ferromagnetism in a one-dimensional Hubbard model; Study using the density-matrix renormalization-group method

被引：25
|
作者：
Sakamoto, H
Kubo, K
机构：
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1996年 / 65卷 / 12期
关键词：
Hubbard model; DMRG; metallic ferromagnetism; (nearly-)flat hand model;
D O I：
10.1143/JPSJ.65.3732
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We examined a one-dimensional Hubbard model with nearest- and next-nearest-neighbor hopping with up to 32 sites by means of the density-matrix renormalization-group method. The model has two energy bands and includes the flat-band model studied by Tasaki as a special case. The model with finite band dispersion is found to show metallic (saturated) ferromagnetism for a sufficiently strong interaction. No partially polarized ground state is found. The interaction necessary to realize a ferromagnetic ground state becomes weak when the electron density is decreased from the quarter-filling.
引用
收藏
页码：3732 / 3735
页数：4
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