A self-consistent cluster study of the Emery model


  • * email: UPH301 and UPH084 at DDOHRZ11.


We calculate Fermi-surface properties of the Cuprate superconductors within the three band Hubbard model (also called the Emery model) using a cluster expansion for the proper selfenergy. The Fermi-surface topology is in agreement with angular-resolved photoemission data for dopings ∼ 20%. We discuss possible violations of the Luttinger sum-rule for smaller dopings and the role of van-Hove singularities in the density of states of the Zhang-Rice singlets. We calculate the shift in the chemical potential upon doping and find quantitative agreement with recent experiments.