Strongly reduced gap in the zigzag spin chain with a ferromagnetic interchain coupling

被引：85

作者：

Itoi, C ^{[1
]}

Qin, SJ

机构：

[1] Nihon Univ, Dept Phys, Chiyoda Ku, Tokyo, Japan

[2] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.63.224423

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study a spin-(1/2) Heisenberg zigzag-spin-chain model near decoupled two chains. Taking into account a symmetry breaking perturbation, we discuss the existence of an energy gap in the ferromagnetic interchain coupling as well as the antiferromagnetic one. In the ferromagnetic model, a marginally relevant fixed line reduces the gap strongly, so that the correlation length becomes an astronomical length scale even in order one coupling. This result agrees with density-matrix renormalization group results.

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页数：6

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