Electronic excitations in Bi2Sr2CaCu2O8 : Fermi surface, dispersion, and absence of bilayer splitting
Abstract
From a detailed study, including polarization dependence, of the normal state angle-resolved photoemission spectra for Bi2Sr2CaCu2O8, we find only one CuO2 band related feature. All other spectral features can be ascribed either to umklapps from the superlattice or to ``shadow bands''. Even though the dispersion of the peaks looks like band theory, the lineshape is anomalously broad and no evidence is found for bilayer splitting. We argue that the ``dip feature'' in the spectrum below Tc arises not from bilayer splitting, but rather from many body effects.
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