Fominykh N. and Berakdar J.
Journal of Electron Spectroscopy and Related Phenomena 161, pp 125-127 (2007)We study theoretically the one-photon two-electron emission from the Cu(1 1 1) surface. Tuning the energy to either the surface state or to the dband energy regions this sample provides a paradigm example of the two-particle emission from a (quasi) two-dimensional and a three-dimensional system, respectively. The independent electrongas behavior of the surface-state electrons results in a characteristic angular pattern. We inspect the dependence of this angular shape on the strength of the electronelectron interaction. Furthermore, it is shown that the two-particle energy correlation behaves differently for bulk and surface states.
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