Onset of incommensurability in quantum spin chains
Strongly Correlated Electrons
2009-11-07 v2 Statistical Mechanics
Abstract
In quantum spin chains, it has been observed that the incommensurability occurs near valence-bond-solid (VBS)-type solvable points, and the correlation length becomes shortest at VBS-type points. Besides, the correlation function decays purely exponentially at VBS-type points, in contrast with the two-dimensional (2D) Ornstein-Zernicke type behavior in the other region with an excitation gap. We propose a mechanism to explain the onset of the incommensurability and the shortest correlation length at VBS-like points. This theory can be applicable for more general cases.
Cite
@article{arxiv.cond-mat/0210143,
title = {Onset of incommensurability in quantum spin chains},
author = {Kiyohide Nomura},
journal= {arXiv preprint arXiv:cond-mat/0210143},
year = {2009}
}
Comments
9 pages, 2 figures