Incommensuration in quantum antiferromagnetic chain
Statistical Mechanics
2009-10-31 v1 Strongly Correlated Electrons
Abstract
A dimerized quantum Heisenberg or XY antiferromagnetic chain has a gap in the spectrum. We show that a weak incommensurate modulation around a dimerized chain produces a zero temperature quantum critical point. As the incommensuration wavelength is varied, there is a transition to a modulated gapless state. The critical behaviour is in the universality class of the classical commensurate-incommensurate (Pokrovsky-Talapov) transition. An analogous metal-insulator transition can also take place for an incommensurate chain.
Cite
@article{arxiv.cond-mat/9808219,
title = {Incommensuration in quantum antiferromagnetic chain},
author = {Somendra M. Bhattacharjee and Sutapa Mukherji},
journal= {arXiv preprint arXiv:cond-mat/9808219},
year = {2009}
}
Comments
5 pages, revtex, no figures, to appear in J. Phys A Letters