Schumann FO, Kirschner J, Berakdar J. Mapping out electron-electron interactions at surfaces.
PHYSICAL REVIEW LETTERS 2005;
95:117601. [PMID:
16197047 DOI:
10.1103/physrevlett.95.117601]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2005] [Indexed: 05/04/2023]
Abstract
Using a high resolution coincidence technique, we measured for the first time the angular and energy correlation of an electron pair emitted from the valence band of a single crystal upon the impact of an electron with a specified momentum. We observe a hole in the measured two-particle correlation function when the two excited electrons have comparable momentum vectors, a fact traced back to exchange and repulsion among the electrons. We find the hole is not isotropic, has a finite extension, and is strongly suppressed when decoherence is operating.
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