Two-Dimensional Quantum XY Model with Ring Exchange and External Field
Strongly Correlated Electrons
2009-11-10 v1
Abstract
We present the zero-temperature phase diagram of a square lattice quantum spin 1/2 XY model with four-site ring exchange in a uniform external magnetic field. Using quantum Monte Carlo techniques, we identify various quantum phase transitions between the XY-order, striped or valence bond solid, staggered Neel antiferromagnet and fully polarized ground states of the model. We find no evidence for a quantum spin liquid phase.
Cite
@article{arxiv.cond-mat/0311080,
title = {Two-Dimensional Quantum XY Model with Ring Exchange and External Field},
author = {R. G. Melko and A. W. Sandvik and D. J. Scalapino},
journal= {arXiv preprint arXiv:cond-mat/0311080},
year = {2009}
}
Comments
4 pages, 4 figures