FERRIMAGNETIC LONG-RANGE ORDER OF THE HUBBARD-MODEL

被引：73
|
作者：
SHEN, SQ [1 ]
QIU, ZM [1 ]
TIAN, GS [1 ]
机构：
[1] BEIJING UNIV,DEPT PHYS,BEIJING 100871,PEOPLES R CHINA
来源：
PHYSICAL REVIEW LETTERS | 1994年 / 72卷 / 08期
关键词：
D O I：
10.1103/PhysRevLett.72.1280
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In this paper, we show rigorously that there exists the ferrimagnetic long-range order in the ground state of the positive-U Hubbard model at half filling on some bipartite lattices. When N-A > N-B (N-A and N-B are the total site numbers of two sublattices A and B), except for the ferromagnetism which was found by Lieb [Phys. Rev, Lett. 62, 1201 (1989)], there also exists the antiferromagnetic long-range order in the ground state. This result only requires U > O and is independent of the dimension of the lattices.
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收藏
页码：1280 / 1282
页数：3
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