Phys. Rev. Lett. 100, 137201 (2008) [4 pages]Square-Lattice Algebraic Spin Liquid with SO(5) SymmetryReceived 5 December 2007; published 2 April 2008 We propose a critical spin liquid ground state for S=1/2 antiferromagnets on the square lattice. In a renormalization group analysis of the “staggered flux“ algebraic spin liquid, we examine perturbations, present in the antiferromagnet, which break its global SU(4) symmetry to SO(5). At physical parameter values, we find an instability towards a fixed point with SO(5) symmetry. We discuss the possibility that this fixed point describes a transition between the Néel and valence bond solid states, and the relationship to the SO(5) nonlinear sigma model of Tanaka and Hu. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.137201
DOI:
10.1103/PhysRevLett.100.137201
PACS:
75.10.Jm, 11.15.Ha, 71.10.Hf, 75.45.+j
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.