Yang Qi, Cenke Xu, Subir Sachdev
Published 2008-09-03, updated 2009-04-04Version 4
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.
Comments: 4 pages, 2 figures; (v2) added refs and minor changes; (v3) updated ref on experiment; (v4) added supplement with calculational details
Journal: Phys. Rev. Lett. 102, 176401 (2009)
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