We present high-resolution photoemission data of the Γ-surface state on Be(0001). Near the Fermi surface a narrow quasiparticle peak caused by strong electron-phonon coupling emerges. A many-body calculation is performed, which describes precisely the exceptional evolution of the experimental spectra. We demonstrate that all the necessary parameters can be directly deduced from the experiment.
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Hengsberger et al. (1999) studied this question.
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