Spectral Properties of HighT$_c$ Cuprates via a ClusterPerturbation Approach
Abstract
Angularresolved photoemission data on halffilled doped cuprate materials are compared with an exactdiagonalization analysis of the threeband Hubbard model, which is extended to the infinite lattice by means of a perturbation in the intercluster hopping (cluster perturbation theory). A study of the band dispersion and spectral weight of the insulating cuprate Sr$_2$CuO$_2$Cl$_2$ allows us to fix a consistent parameter set, which turns out to be appropriate at finite dopings as well. In the overdoped regime, our results for the spectral weight and for the Fermi surface give a good description of the experimental data on Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$. In particular, the Fermi surface is holelike and centered around $k=(\pi,\pi)$. Finally, we introduce a hopping between two layers and address the issue of bilayer splitting.
 Publication:

arXiv eprints
 Pub Date:
 November 2001
 arXiv:
 arXiv:condmat/0111061
 Bibcode:
 2001cond.mat.11061D
 Keywords:

 Condensed Matter  Strongly Correlated Electrons;
 Condensed Matter  Superconductivity
 EPrint:
 Accepted for publication in JLTP as a contribution to the "Festschrift" dedicated to Prof. P. Woelfle's sixtieth birthday