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

Abstract

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

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

References in corpus (2)

• Realization of a Spin liquid in a Two Dimensional Quantum Antiferromagnet
• Optimized RVB states of the 2-d antiferromagnet: Ground state and excitation spectrum

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