Correlation effects on the electronic properties of Bi2Sr2CaCu2O8

We have studied the role of on-site electronic correlation on the band structure of Bi2Sr2CaCu2O8. In our approach, an ab initio calculation supplies for the single particle starting point, on top of which self-energy effects are explicitly taken into account in the framework of the threebody scattering theory (3BS). We observe that correlation modifies the energy dispersion of hole quasiparticle states near the Fermi level, especially close to the X and M symmetry points, but does not induce sensible changes at the Fermi level. To sustain this picture, we report calculations of effective masses.