Abstract
Angular-resolved photoemission data on half-filled doped cuprate materials are compared with an exact-diagonalization analysis of the three-band 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+δ. In particular, the Fermi surface is hole-like and centered around k=(π, π) . Finally, we introduce a hopping between two layers and address the issue of bilayer splitting.
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Dahnken, C., Arrigoni, E. & Hanke, W. Spectral Properties of High-Tc Cuprates via a Cluster-Perturbation Approach. Journal of Low Temperature Physics 126, 949–959 (2002). https://doi.org/10.1023/A:1013898709475
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DOI: https://doi.org/10.1023/A:1013898709475