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Winkelmann, A., Ellguth, M., Tusche, C., √únal, A. A., Henk, J., Kirschner, J.

Momentum-resolved photoelectron interference in crystal surface barrier scattering
Physical Review B 86, (8),pp 085427/1-5 (2012)
The quantum-mechanical transmission process of a photoelectron through a surface leaves distinctive marks in the electron momentum distribution emitted from a crystal. By energy-resolved measurements of the complete photoemission half-space above a Cu(001) surface using a momentum microscope, we identify the two-path interference of directly emitted photoelectrons and electrons, which have been scattered through the surface quantum well via a diffraction process. The basic principle of photoelectron surface barrier interference is revealed by an analytical model. A quantitative comparison to the experiment is obtained by one-step photoemission calculations for different surface barrier models.