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O: Oberflächenphysik
O 34: Elektronische Struktur IV
O 34.3: Talk
Thursday, March 27, 2003, 15:30–15:45, M\"UL/ELCH
Photon emission from Na on Cu(111) induced by local electron injection — •Germar Hoffmann1, Richard Berndt2, and Peter Johansson3 — 1Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts Universität zu Kiel — 3Department of Natural Sciences, University of Örebro, Sweden
Energetically well-defined states, so called quantum well states, which exist in Na monolayers on Cu(111) represent a two dimensional electron gas. These states are probed locally by scanning tunneling microscopy / spectroscopy. Additionally, the injection of electrons or holes induces photon emission. In optical spectra we identify inelastic tunneling processes and interband transitions in agreement with numerical calculations. Moreover, the data reveal two-electron processes which we attribute, based on modelling, to Auger and hot-hole processes.