Theory Department
Max Planck Institute of Microstructure Physics
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Schumann, F. O., Kirschner, J., Berakdar, J.

Mapping out electron-electron interactions at surfaces
Physical Review Letters 95, (11),pp 117601/1-4 (2005)
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.

TH-2005-31