Striped phase in a quantum XY-model with ring exchange
Strongly Correlated Electrons
2009-11-07 v2
Abstract
We present quantum Monte Carlo results for a square-lattice S=1/2 XY-model with a standard nearest-neighbor coupling J and a four-spin ring exchange term K. Increasing K/J, we find that the ground state spin-stiffness vanishes at a critical point at which a spin gap opens and a striped bond-plaquette order emerges. At still higher K/J, this phase becomes unstable and the system develops a staggered magnetization. We discuss the quantum phase transitions between these phases.
Cite
@article{arxiv.cond-mat/0205270,
title = {Striped phase in a quantum XY-model with ring exchange},
author = {A. W. Sandvik and S. Daul and R. R. P. Singh and D. J. Scalapino},
journal= {arXiv preprint arXiv:cond-mat/0205270},
year = {2009}
}
Comments
4 pages, 4 figures. v2: only minor changes