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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.67: Poster

Mittwoch, 16. März 2011, 17:30–21:00, P4

Observing optical transitions inside an STM junction: a study on field emission resonances and molecular wires — •Gunnar Schulze, Thomas Sirtl, Marten Piantek, Jingcheng Li, Katharina Franke, and Jose Ignacio Pascual — Institut für Experimentalphysik, Freie Universität Berlin, Berlin, Germany

Light emitted from direct optical transitions of tunneling electrons in a scanning tunneling microscope (STM) junction can provide rich information about electronic systems. Resulting spectra reflect the interaction of plasmonic and electronic degrees of freedom and can reveal an energy resolved picture of dipole active inelastic transitions during tunneling. Our STM light emission (STM-LE) experiments aim to get closer insights into the nature of these effects. In our study on field emission resonances (FER) on a metal surface we demonstrate the observation of direct optical electron transitions. A second study deals with the activation of inelastic transitions inside a single molecular wire and their effects on the STM-LE spectra.