Large-N expansion for frustrated quantum antiferromagnets
Abstract
A large-N expansion technique based on symplectic [Sp(N)] symmetry for frustrated magnetic systems is proposed and applied to the square-lattice quantum antiferromagnet with first-, second-, and third-neighbor antiferromangetic coupling. In addition to disordered states similar to those in unfrustrated systems, phases with incommensurate coplanar spin correlations and unconfined bosonic spinons are found. The occurrence of ``order from disorder'' is discussed. Neither chirally ordered nor spin-nematic states are found.
- Publication:
-
Physical Review Letters
- Pub Date:
- April 1991
- DOI:
- 10.1103/PhysRevLett.66.1773
- Bibcode:
- 1991PhRvL..66.1773R
- Keywords:
-
- 75.10.Jm;
- 74.65.+n;
- 75.50.Ee;
- Quantized spin models;
- Antiferromagnetics