Regensburg 2004 – scientific programme

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O: Oberflächenphysik

O 15: Hauptvortrag M. A. Schneider

O 15.1: Invited Talk

Tuesday, March 9, 2004, 09:30–10:15, H36

Electron Spectroscopy of Many-Body Interaction using Scanning Tunneling Microscopy — •M. Alexander Schneider, Lucia Vitali, Peter Wahl, Lars Diekhöner, Gero Wittich, Michael Vogelgesang, and Klaus Kern — Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart

Electron spectroscopy is pivotal to solid state physics. When traditional spectroscopy methods like photoelectron spectroscopy, Auger electron spectroscopy, electron energy loss spectroscopy, etc. reach their limits to study electronic states in nanostructures, molecules or atoms, microscopy is the method of choice. Scanning Tunneling Spectroscopy (STS), is a microscopy method that can provide the wanted spectroscopical information in many cases with atomic scale resolution.

In this talk I will discuss the possibilities of STS with regard to many-body interaction in nanostructures. Among these are electron-electron processes that limit the life time of hot electrons in surface or image-potential states. But also the interaction of a magnetic adatom or molecule with a non-magnetic substrate can lead to the formation of a correlated many-body state, the Kondo state. The spectroscopy of single impurity Kondo systems provides insight into this interaction of a magnetic impurity with the electrons at the surface of metals.