Strongly reduced gap in the zigzag spin chain with a ferromagnetic interchain coupling
Statistical Mechanics
2009-10-31 v3
Abstract
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 1 coupling. This result agrees with density matrix renormalization group results.
Cite
@article{arxiv.cond-mat/0006155,
title = {Strongly reduced gap in the zigzag spin chain with a ferromagnetic interchain coupling},
author = {Chigak Itoi and Shaojin Qin},
journal= {arXiv preprint arXiv:cond-mat/0006155},
year = {2009}
}
Comments
7pages, 5figures, revised version