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SU(4) Theory for Spin Systems with Orbital Degeneracy
1998
Physical Review Letters
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The isotropic limit of spin systems with orbital degeneracy is shown to have global SU(4) symmetry. On many 2D lattices, the ground state does not posses long range order, which may explain the observed spin liquid properties of LiNiO_2. In the SU(4) Neel ordered state, spin-spin correlations can be antiferromagneitc between two neighboring sites with parallel magnetic moments.
doi:10.1103/physrevlett.81.3527
fatcat:xe62t27hmvgmvefwmo5hpgvsgi