SPECTRAL FUNCTIONS OF ELECTRON-DOPED CU-OXIDE CLUSTER MODEL INCLUDINGFULL MULTIPLET

The effect of electron doping on the 3d photoemission (PES), 3d invers e photoemission (IPES) and Cu 2p PES are investigated for Cu-oxide fin ite clusters including the intraatomic full multipole electrostatic in teractions by means of the recursion and Lanczos methods. For 3d PES a nd 3d IPES, upon doping, the chemical potential shifts to the lower ed ge of the conduction band and two new structures corresponding to 'd(1 0) --> d(9)' appear inside the insulating gap; one located in the vici nity of the conduction band edge arising mainly from d(x2-y2) and the other located near the valence band edge arising mainly from those oth er than d(x2-y2) symmetry. The strong intersite charge transfer effect leads to drastic spectral weight transfer to these newly created stat es inside the gap. For the Cu 2p PES spectra, a remarkable spectral we ight transfer to the newly formed 'cd(10)' peak upon doping is also as cribed to intersite charge transfer effect.