Anisotropic two-dimensional Heisenberg model by Schwinger-boson Gutzwiller projected method

1994/08/22 by T. Miyazaki, D. Yoshioka, M. Ogata · 1 citation
Physics and Astronomy · #cond-mat

paper · pdf · doi:10.1103/physrevb.51.2966

published as Phys. Rev. B 51 (1995) 2966 · 15 pages RevTex3.0, 4 figures, available upon request, GWRVB8-94

arxiv created 1994/08/22 · arxiv updated 2009/11/30

Abstract

Two-dimensional Heisenberg model with anisotropic couplings in the x and y directions (J_x ≠ J_y) is considered. The model is first solved in the Schwinger-boson mean-field approximation. Then the solution is Gutzwiller projected to satisfy the local constraint that there is only one boson at each site. The energy and spin-spin correlation of the obtained wavefunction are calculated for systems with up to 20 × 20 sites by means of the variational Monte Carlo simulation. It is shown that the antiferromagnetic long-range order remains down to the one-dimensional limit.

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