Effects of the slave-boson fluctuations on the photoemission and inverse photoemission spectra of the CuO 2 three-band model

Abstract

The photoemission and inverse-photoemission spectra of the high- T c cuprates have been studied in the slave-boson approach that takes into account the self-energies of both fermion and boson propagators. The coupled perturbation series of the component fermion Green's functions have been summed in the closed form of the matrix Dyson equation, which is then solved to obtain the dressed fermion propagators. The density-of-states spectra calculated for the ‘bare’ Cu d-electrons and oxygen p-electrons reveal the characteristics structures of the d-like narrow quasiparticle states near E F , the p-like bonding andnonbonding states, and the deep ‘bare’ d-electron states.