GUTZWILLER WAVE-FUNCTION IN THE 3-BAND HUBBARD-MODEL - A VARIATIONAL MONTE-CARLO STUDY

The Gutzwiller wave function for the three-band Hubbard model on a two -dimensional CuO2 plane is studied by using the variational Monte Carl o (VMC) method in the limit U(d) --> infinity, where U(d) is the Coulo mb repulsion between holes on a Cu site. The VMC results for the energ y and the fraction of d holes are compared with those of the Rice-Ueda type Gutzwiller approximation (GA). The difference between the VMC an d the GA results are most pronounced at half-filling, and away from ha lf-filling the two results agree well in both the hole-doped and the e lectron-doped cases. The doping dependence of the momentum distributio n function is also studied.