Abstract
We perform a renormalization group analysis of some important effective field theoretic models for deconfined spinons. We show that deconfined spinons are critical for an isotropic Heisenberg antiferromagnet, if is large enough. We argue that nonperturbatively this result should persist down to and provide further evidence for the so-called deconfined quantum criticality scenario. Deconfined spinons are also shown to be critical for the case describing a transition between quantum spin nematic and dimerized phases. On the other hand, the deconfined quantum criticality scenario is shown to fail for a class of easy-plane models. For the cases where deconfined quantum criticality occurs, we calculate the critical exponent for the decay of the two-spin correlation function to first-order in . We also note the scaling relation connecting the exponent for the decay to the correlation length exponent and the crossover exponent .
- Received 22 October 2007
DOI:https://doi.org/10.1103/PhysRevB.76.220403
©2007 American Physical Society