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O: Fachverband Oberflächenphysik
O 7: Surface Dynamics I
O 7.4: Vortrag
Montag, 14. März 2011, 12:00–12:15, WIL C107
Waveguiding of hot surface state electrons by the Au(111) reconstruction — •Viktor Geringer1,2, Dinesh Subramaniam1,2, Florian Libisch3, Marcus Liebmann1,2, and Markus Morgenstern1,2 — 1II. Institute of Physics, RWTH Aachen University, Otto-Blumenthal-Str., 52074 Aachen, Germany — 2JARA: Fundamentals of Future Information Technology — 3Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10/136, A-1040 Vienna, Austria
Using scanning tunneling spectroscopy (STS) we perform a spatial and energy dependent study of the electronic scattering behavior on the Au(111) surface. In spite of the small surface reconstruction potential (35 meV), our measurements reveal a surprising effect of wave guiding. Electrons with energies up to twenty times larger than the corrugation of the potential follow the geometry of the reconstruction, observable through a strong anisotropy in the distribution of the wave vectors. In order to explain this behavior we calculated the square of the electronic wave function evidencing quantum-mechanical orthogonality as the origin of the waveguiding effect.