Mixed Valence Quasiparticles in CuO2 Planes
J. Bałaa and A.M. Oleśa,b
aInstitute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
bMax-Planck-Institut FKF, Heisenbergstrasse 1, 70569 Stuttgart, Germany
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The motion of a single hole doped to a CuO2 plane of a high temperature superconductor is described by a spin-fermion model which treats explicitly the hybridization with the upper Hubbard band. One finds that sectors of Zhang-Rice bound states coexist with reasonably damped oxygen and copper-like quasiparticles, with a considerable transfer of the spectral weight to the upper Hubbard band. The oxygen states have small dispersions and can be identified in the angle-resolved photoemission experiments for Bi2Sr2CaCu2O8.
DOI: 10.12693/APhysPolA.91.333
PACS numbers: 74.25.Jb, 75.10.Lp, 75.30.Ds