Optimized RVB states of the 2-d antiferromagnet: Ground state and excitation spectrum

Details Optimized RVB states of the 2-d antiferromagnet: Ground state and excitation spectrum Optimized RVB states of the 2-d antiferromagnet: Ground state and excitation spectrum

1993-09-27

arxiv.org/abs/cond-mat/9309042v1

Physics

Condensed Matter

LATEX, 13 pages and 2 figures (in latex too)

Scientific paper

10.1016/0375-9601(93)90391-C

The Gutzwiller projection of the Schwinger-boson mean-field solution of the 2-d spin-1/2 antiferromagnet in a square lattice is shown to produce the optimized, parameter-free RVB ground state. We get $-0.6688J$/site and $0.311$ for the energy and the staggered magnetization. The spectrum of the excited states is found to be linear and gapless near $\bk\cong 0$. Our calculation suggests, upon breaking of the rotational symmetry, $\epsilon_{\bk}\cong 2JZ_{r} \sqrt{1-\gamma_{\bk}^{2}}$ with $Z_{r}\cong 1.23$. To appear in Phys. Lett. A (1993).

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