STRONG-COUPLING EXPANSIONS FOR ANTIFERROMAGNETIC HEISENBERG SPIN-ONE-HALF LADDERS

被引：96

作者：

REIGROTZKI, M ^{[1
]}

TSUNETSUGU, H ^{[1
]}

RICE, TM ^{[1
]}

机构：

[1] SWISS FED INST TECHNOL,INTERDISCIPLINARES PROJEKTZENTRUM SUPERCOMP,CH-8092 ZURICH,SWITZERLAND

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1994年 / 6卷 / 43期

关键词：

D O I：

10.1088/0953-8984/6/43/021

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The properties of antiferromagnetic Heisenberg S = 1/2 ladders with two, three and four chains are expanded in the ratio of the intrachain and interchain coupling constants. A simple mapping procedure is introduced to relate the four- and two-chain ladders, which keep to moderate values of the expansion parameters. A second-order calculation of the spin gap to the lowest triplet excitation in the two- and four-chain ladders is found to be quite accurate, even at the isotropic point where the couplings are equal. Similar expansions and mapping procedures are presented for the three-chain ladders, which are in the same universality class as single chains.

引用

页码：9235 / 9245

页数：11

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