Optimizing the RVB state on a triangular lattice: Presence of the long-range order

Details Optimizing the RVB state on a triangular lattice: Presence of the long-range order Optimizing the RVB state on a triangular lattice: Presence of the long-range order

1993-12-15

arxiv.org/abs/cond-mat/9312059v1

Physics

Condensed Matter

11 pages, plain LATEX (no local report #)

Scientific paper

We present a Schwinger-boson approach for the RVB state of the spin-1/2 Heisenberg antiferromagnet on a triangular lattice. It is shown that Gutzwiller projection of the mean-field state that includes both antiferromagnetic and ferromagnetic decouplings leads to optimizing the RVB pair amplitudes within a self-consistent approximation. The resulting state yields, by Monte Carlo simulations, energies and spin-spin correlations in excellent agreement with the exact diagonalization result on finite lattices (up to 36 sites). We conclude that the optimized RVB wavefunction possesses a long-range three-sublattice order.

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