%0 Journal Article
%T Quantum Phases of the Shastry-Sutherland Antiferromagnet
%A C. H. Chung
%A J. B. Marston
%A Subir Sachdev
%J Physics
%D 2001
%I arXiv
%R 10.1103/PhysRevB.64.134407
%X We study possible paramagnetic phases of antiferromagnets on the Shastry-Sutherland lattice by a gauge-theoretic analysis of fluctuations in a theory with Sp(2N) symmetry. In addition to the familiar dimer phase, we find a confining phase with plaquette order, and a topologically ordered phase with deconfined S=1/2 spinons and helical spin correlations. The deconfined phase is contiguous to the dimer phase, and in a regime of couplings close to those found in the insulator SrCu2(BO3)2. We suggest that a superconductor obtained by doping this insulator with mobile charge carriers will be an attractive candidate for observing the anomalous magnetic flux properties associated with topological order.
%U http://arxiv.org/abs/cond-mat/0102222v2