Band structure and antiferromagnetism of a single CuO2 layer

We have solved a set of self-consistency equations for the three-band model describing electrons coupled strongly by antiferromagnetic correlations in a single CuO₂ layer. Strong but finite Hubbard correlations are taken into account by using a random phase approximation for the electronic propagators which contain the combined effect of both the Hubbard correlation and the hybridization of copper and nearest neighbor oxygen states. From the Green functions the band structure is determined, which depends strongly on the doping fraction and the antiferromagnetic order parameter 〈s_Q〉. The main impact of doping is to decrease the magnitude of antiferromagnetic fluctuations, although the decrease appears to be quite slow when compared with experimental data.