Dominance of the final state in photoemission mapping of the Fermi surface of Co/Cu(001)

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The first-principles calculations to predict the angular distribution of photoelectrons from the Fermi level of Co/Cu(001) is used and compared with experimental determinations. The predicted angular distributions agree with observations but the shapes of the angular distributions are found to reflect those of the final states rather than the initial occupied state, which in these measurements is the Fermi surface. In the case of Co and other flat-band materials, the lack of strong dispersion of the initial state means that the angular distribution will be more heavily influenced by the final state which disperses much more rapidly, and provides for significant matrix elements within much more limited regions of k space.

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Physical Review Letters

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