Gutzwiller wavefunction in the three-band Hubbard model: A variational Monte Carlo study

Abstract

The Gutzwiller wave function for the three-band Hubbard model on a two dimensional CuO${}_2$ plane is studied by using the variational Monte Carlo (VMC) method in the limit $U_d\to \infty$, where $U_d$ is the Coulomb repulsion between holes on a Cu site. The VMC results for the energy and the fraction of $d$-holes are compared with those of the Rice-Ueda type Gutzwiller approximation (GA). The difference between the VMC and the GA results are most pronounced at half-filling, and away from half-filling the two results agree well in both the hole-doped and the electron-doped cases. The doping dependence of the momentum distribution function is also studied.

18 pages (RevTeX), 8 figures (postscript) appended, for remaining 5 figures contact [email protected]

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