Upper bounds to the spin gap for quantum spin-1/2 systems from coupled chains to square lattice

被引：2
|
作者：
Song, Z
机构：
[1] Department of Physics, Nankai University
来源：
PHYSICS LETTERS A | 1997年 / 233卷 / 1-2期
关键词：
D O I：
10.1016/S0375-9601(97)00435-0
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The spin-1/2 antiferromagnetic Heisenberg model on an L x n(c) (n(c) is even) lattice with periodic boundary conditions is studied in the framework of a variational approach. It is shown that the upper bounds of the spin gap of the ladders with any width n(c) decrease as (4n(c) -2)/n(c)(2). (C) 1997 Elsevier Science B.V.
引用
收藏
页码：135 / 138
页数：4
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