Spin Bose-Metal and Valence Bond Solid phases in a spin-1/2 model with ring exchanges on a four-leg triangular ladder
Strongly Correlated Electrons
2011-05-20 v3
Abstract
We study a spin-1/2 system with Heisenberg plus ring exchanges on a four-leg triangular ladder using the density matrix renormalization group and Gutzwiller variational wave functions. Near an isotropic lattice regime, for moderate to large ring exchanges we find a spin Bose-metal phase with a spinon Fermi sea consisting of three partially filled bands. Going away from the triangular towards the square lattice regime, we find a staggered dimer phase with dimers in the transverse direction, while for small ring exchanges the system is in a featureless rung phase. We also discuss parent states and a possible phase diagram in two dimensions.
Cite
@article{arxiv.1009.1179,
title = {Spin Bose-Metal and Valence Bond Solid phases in a spin-1/2 model with ring exchanges on a four-leg triangular ladder},
author = {Matthew S. Block and D. N. Sheng and Olexei I. Motrunich and Matthew P. A. Fisher},
journal= {arXiv preprint arXiv:1009.1179},
year = {2011}
}
Comments
4 pages, 5 figures, v3 is the print version