Electronic excitations in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_8$ : 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 Bi${}_2$Sr${}_2$CaCu${}_2$O${}_8$, we find only one CuO${}_2$ 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 $T_c$ arises not from bilayer splitting, but rather from many body effects.

4 pages, revtex, 3 uuencoded postscript figures

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• $P{b}_{0.4}B{i}_{1.6}S{r}_{2}C{a}_{1}C{u}_2{O}_{8+x}$ and Oxygen Stoichiometry: Structure, Resistivity, Fermi Surface Topology and Normal State Properties

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