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A self‐consistent cluster study of the Emery model
Author(s) -
Gros Claudius,
Valentí Roser
Publication year - 1994
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19945060604
Subject(s) - physics , hubbard model , superconductivity , cuprate , fermi surface , cluster (spacecraft) , condensed matter physics , gravitational singularity , fermi gamma ray space telescope , quantum mechanics , computer science , programming language
Abstract 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.