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

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

1994-08-22

arxiv.org/abs/cond-mat/9408065v1

Phys. Rev. B 51 (1995) 2966

Physics

Condensed Matter

15 pages RevTex3.0, 4 figures, available upon request, GWRVB8-94

Scientific paper

10.1103/PhysRevB.51.2966

Two-dimensional Heisenberg model with anisotropic couplings in the $x$ and $y$ directions ($J_x \neq J_y$) 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 $20 \times 20$ 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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