Resonating-Valence-Bond Ground-state of CaV$_4$O$_9$ by the Gutzwiller-projected Schwinger-boson method

Details Resonating-Valence-Bond Ground-state of CaV$_4$O$_9$ by the Gutzwiller-projected Schwinger-boson method Resonating-Valence-Bond Ground-state of CaV$_4$O$_9$ by the Gutzwiller-projected Schwinger-boson method

1996-02-26

arxiv.org/abs/cond-mat/9602133v2

Physics

Condensed Matter

10 pages(including figure captions) RevTex3.0, 4 figures, available upon request

Scientific paper

10.1143/JPSJ.65.2370

An antiferromagnetic Heisenberg model on a 1/5-depleted two-dimensional square-lattice, a model of CaV$_4$O$_9$, is investigated by variational Monte Carlo simulation. A prototype of a trial wave function is made by projecting out the doubly occupied states from the Schwinger-boson mean-field solution. Then variational Monte Carlo simulation is performed up to $40 \times 40 $ sites(including $320$ vacant sites). The optimized state has the lowest energy, $-0.5510J$, ever reported. For this state energies of a dimer bond and a plaquette bond, staggered magnetization, static structure factor, and excitation spectrum are calculated. It is shown that the N\'eel order survives and there is no gap at isotropic coupling.

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