SU(4) Theory for Spin Systems with Orbital Degeneracy

Y. Q. Li; Michael Ma; D. N. Shi; F. C. Zhang

doi:10.1103/PhysRevLett.81.3527

SU(4) Theory for Spin Systems with Orbital Degeneracy

Y. Q. Li, Michael Ma, D. N. Shi, and F. C. Zhang

Phys. Rev. Lett. 81, 3527 – Published 19 October 1998

Abstract

The isotropic limit of spin systems with orbital degeneracy has global SU(4) symmetry. On many 2D lattices, the ground state does not possess long-range order, which may explain the observed spin liquid properties of ${LiNiO}_{2}$ . In the SU(4) Néel-ordered state, spin-spin correlations can be antiferromagnetic between two neighboring sites with parallel magnetic moments.

Received 15 April 1998

DOI:https://doi.org/10.1103/PhysRevLett.81.3527

Authors & Affiliations

Y. Q. Li^1,2, Michael Ma¹, D. N. Shi^1,3, and F. C. Zhang¹

¹Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221
²Department of Physics, Zhejiang University, Hangzhou, China
³College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing, China