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Spin-Wave Theory and Finite-Size Scaling for the Heisenberg Antiferromagnet

Zheng Weihong·C. J. Hamer
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Abstract

Spin-wave perturbation theory for the Heisenberg antiferromagnet at zero temperature is used to compute the finite-lattice corrections to the ground state energy, the staggered magnetization and the energy gap. The dispersion relation, the spin-wave velocity and the bulk ground state energy to order $O(1/S^2)$ are also computed for the square lattice. The results agree very well with the predictions of Neuberger and Ziman and Fisher.

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Zheng Weihong, C. J. Hamer. 1992-12-14. Spin-Wave Theory and Finite-Size Scaling for the Heisenberg Antiferromagnet. https://doi.org/10.1103/physrevb.47.7961

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