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Spin-wave theory of the quantum antiferromagnet with unbroken sublattice symmetry

1989; American Physical Society; Volume: 40; Issue: 7 Linguagem: Inglês

10.1103/physrevb.40.4769

1095-3795

J. E. Hirsch, Sanyee Tang,

Quantum and electron transport phenomena

We discuss the properties of spin-wave theory of quantum antiferromagnets with an additional constraint that restores the sublattice symmetry. Our treatment is analogous to Takahashi's recent theory of low-dimensional ferromagnets, and closely related to the Schwinger boson theory of Arovas and Auerbach. We obtain exact results for spin-spin correlations of 2, 4, and 8 spins in a singlet state, and exceedingly close agreement with exact results for S=(1/2 in a variety of other cases. The implication for the long-range order of the d=2, S=(1/2 Heisenberg antiferromagnet is discussed.