Electronic excitations in Bi$_2$Sr$_2$CaCu$_2$O$_8$ : Fermi surface, dispersion, and absence of bilayer splitting

Details Electronic excitations in Bi$_2$Sr$_2$CaCu$_2$O$_8$ : Fermi surface, dispersion, and absence of bilayer splitting Electronic excitations in Bi$_2$Sr$_2$CaCu$_2$O$_8$ : Fermi surface, dispersion, and absence of bilayer splitting

1995-07-07

arxiv.org/abs/cond-mat/9507020v1

Phys Rev Lett 76, 1533 (1996)

Physics

Condensed Matter

4 pages, revtex, 3 uuencoded postscript figures

Scientific paper

10.1103/PhysRevLett.76.1533

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.

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