XY ring-exchange model on the triangular lattice
Superconductivity
2009-11-07 v2 Strongly Correlated Electrons
Abstract
We study ring-exchange models for bosons or XY-spins on the triangular lattice. A four-spin exchange leads to a manifold of ground states with gapless excitations and critical power-law correlations. With a nearest-neighbour exchange, fluctuations select a four-fold ferrimagnetically ordered ground state with a small spin/superfluid stiffness which breaks the global U(1) and translational symmetry. We explore consequences for phase transitions at finite temperature and in an in-plane magnetic field.
Cite
@article{arxiv.cond-mat/0212589,
title = {XY ring-exchange model on the triangular lattice},
author = {Leon Balents and Arun Paramekanti},
journal= {arXiv preprint arXiv:cond-mat/0212589},
year = {2009}
}
Comments
9 pgs (RevTeX), 4 figs