Benjamin Hsu, Michael Mulligan, Eduardo Fradkin, Eun-Ah KimPhys. Rev. B 79 115421. DOI: http://dx.doi.org/10.1103/PhysRevB.79.115421. arXiv:0812.0203 Monday, March 16, 2009 Phys. Rev. B 2009 Hsu-1.pdfResearch Area: Topological Phases