We describe neutron scattering, NMR relaxation, and thermal transport properties of Z_2 spin liquids in two dimensions. Comparison to recent experiments on the spin S=1/2 triangular lattice antiferromagnet in kappa-(ET)2Cu2(CN)3 shows that this compound may realize a Z_2 spin liquid. We argue that the topological `vison' excitations dominate thermal transport, and that recent thermal conductivity experiments by M. Yamashita et al. have observed the vison gap.
@article{arxiv.0809.0694,
title = {Dynamics and transport of the Z_2 spin liquid: application to kappa-(ET)2Cu2(CN)3},
author = {Yang Qi and Cenke Xu and Subir Sachdev},
journal= {arXiv preprint arXiv:0809.0694},
year = {2009}
}
Comments
4 pages, 2 figures; (v2) added refs and minor changes; (v3) updated ref on experiment; (v4) added supplement with calculational details