Disorder Induced Quantum Phase Transition in Random-Exchange Spin-1/2 Chains
Disordered Systems and Neural Networks
2009-11-07 v1
Abstract
We investigate the effect of quenched bond-disorder on the anisotropic spin-1/2 (XXZ) chain as a model for disorder induced quantum phase transitions. We find non-universal behavior of the average correlation functions for weak disorder, followed by a quantum phase transition into a strongly disordered phase with only short-range xy-correlations. We find no evidence for the universal strong-disorder fixed point predicted by the real-space renormalization group, suggesting a qualitatively different view of the relationship between quantum fluctuations and disorder.
Cite
@article{arxiv.cond-mat/0111027,
title = {Disorder Induced Quantum Phase Transition in Random-Exchange Spin-1/2 Chains},
author = {K. Hamacher and J. Stolze and W. Wenzel},
journal= {arXiv preprint arXiv:cond-mat/0111027},
year = {2009}
}
Comments
4 pages, 4 postscript figures, needs RevTeX 4