Spectral Properties of High-T$_c$ Cuprates via a Cluster-Perturbation Approach

Details Spectral Properties of High-T$_c$ Cuprates via a Cluster-Perturbation Approach Spectral Properties of High-T$_c$ Cuprates via a Cluster-Perturbation Approach

2001-11-05

arxiv.org/abs/cond-mat/0111061v1

J. Low Temp. Phys. 126, 949 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted for publication in JLTP as a contribution to the "Festschrift" dedicated to Prof. P. Woelfle's sixtieth birthday

Scientific paper

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$_{8+\delta}$. In particular, the Fermi surface is hole-like and centered around $k=(\pi,\pi)$. Finally, we introduce a hopping between two layers and address the issue of bilayer splitting.

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