Using a mapping from the three-band extended Hubbard model for cuprate superconductors into a generalized t-J model, and exact diagonalization of the latter in a 4x4 cluster, we determine the quasiparticle weight for destruction of a Cu or an O electrons with definite wave vector k. We also derive an approximate but accurate analytical expression which relates the O intensity with the quasiparticle weight in the generalized t-J model, and use it to obtain the O intensity from results of the self-consistent Born approximation. The k-dependence of Cu and O intensities is markedly different. In particular the O intensity vanishes for k=(0,0). Our results are relevant for the interpretation of angle-resolved photoemission experiments.
@article{arxiv.cond-mat/9812325,
title = {Angle resolved Cu and O photoemission intensities in CuO_2 planes},
author = {J. M. Eroles and C. D. Batista and A. A. Aligia},
journal= {arXiv preprint arXiv:cond-mat/9812325},
year = {2009}
}