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Spectral Properties of High-T$_c$ Cuprates via a Cluster-Perturbation Approach | | C. Dahnken
; E. Arrigoni
; W. Hanke
; | | Date: |
5 Nov 2001 | | Journal: | J. Low Temp. Phys. 126, 949 (2002) | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | Affiliation: | Univ. of Wuerzburg, Germany | | 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$_{8+delta}$. 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. | | Source: | arXiv, cond-mat/0111061 | | Services: | Forum | Review | PDF | Favorites | |
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