Quantum phase transition in easy-axis antiferromagnetic integer-spin chains
Strongly Correlated Electrons
2007-05-23 v1
Abstract
Antiferromagnetic Heisenberg integer-spin chains are characterized by a spin-liquid ground state with no long-range order, due to the relevance of quantum fluctuations. Spin anisotropy, however, freezes quantum fluctuations, and the system is magnetized in the presence of a sufficiently large easy-axis anisotropy. We numerically investigate the case S=1, by means of the density-matrix renormalization group, and find that the freezing of the spin liquid into a N\'eel spin solid, with increasing easy-axis anisotropy, is a continuous quantum phase transition. Numerical evidence indicates that the transition is not in the two-dimensional Ising universality class.
Cite
@article{arxiv.cond-mat/0307266,
title = {Quantum phase transition in easy-axis antiferromagnetic integer-spin chains},
author = {M. Capone and S. Caprara and L. Cataldi},
journal= {arXiv preprint arXiv:cond-mat/0307266},
year = {2007}
}
Comments
4 pages, 4 figures