Local properties and density of states in the two-dimensional p-d model ofhigh-T-c superconductors - art. no. 214515

The p-d model which well describes the CuO2 planes of the high-T-c. superco nductors is studied by means of the composite operator method. The relevant quasiparticle excitations are represented by composite operators. As a res ult of taking into account spin excitations we find a p-like band near the Fermi level. The dispersion of this band gives a Fermi surface which is in good agreement with the experimental measurements. Due to the strong mixing of the relevant excitations. the spectral weight of this band is reduced a nd gives a large Fermi surface in the moderately doped region. The dependen ce of the calculated physical quantities on model parameters, temperature a nd doping, is in very good agreement with the available quantum Monte Carlo results.