Doping-Induced Spectral Weight Transfer with d-p Interaction

The doping-induced spectral weight transfer is studied by using the d-p model and considering spatial fluctuations in the high-T_c cuprates. The results leaded by the Cu-O interaction are found as follows: (i) the energy levels are grown inside the charge-transfer gap, (ii) the spectral weight is decreased below E_F, and (iii) the d holes at Cu-sites in CuO₂ planes are delocalized with hole doping. Both metal-insulator transition and electrons of two states are also discussed.