Randomness-driven quantum phase transition in bond-alternating Haldane chain
Disordered Systems and Neural Networks
2007-05-23 v2 Statistical Mechanics
Abstract
The effect of bond randomness on the spin-gapped ground state of the spin-1 bond-alternating antiferromagnetic Heisenberg chain is discussed. By using the loop cluster quantum Monte Carlo method, we investigate the stability of topological order in terms of the recently proposed twist order parameter [M. Nakamura and S. Todo: Phys. Rev. Lett. 89 (2002) 077204]. It is observed that the dimer phases as well as the Haldane phase of the spin-1 Heisenberg chain are robust against a weak randomness, though the valence-bond-solid-like topological order in the latter phase is destroyed by introducing a disorder stronger than the critical value.
Keywords
Cite
@article{arxiv.cond-mat/0410755,
title = {Randomness-driven quantum phase transition in bond-alternating Haldane chain},
author = {Takayuki Arakawa and Synge Todo and Hajime Takayama},
journal= {arXiv preprint arXiv:cond-mat/0410755},
year = {2007}
}
Comments
4 pages, 5 figures; minor changes; accepted for publication in J. Phys. Soc. Jpn