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VOLUME 57 (1993) | ISSUE 12 | PAGE 796
Variational bound for the energy of two-dimensional quantum antiferromagnet
We obtain the variational upper bound for the ground-state energy of two-dimensional antiferromagnetk Hekenberg model on a square lattice at arbitrary value of the anisotropy parameter using the two-dimensional generalization of Jordan-Wigner transformation. Our result can be considered as an upper bound for the perturbation theory series about the Jsing limit.