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O: Fachverband Oberflächenphysik

O 62: Posters: Surface Reactions and Dynamics, Nanostructures

O 62.9: Poster

Mittwoch, 2. April 2014, 17:30–21:00, P1

Electronic surface structure of Au/Ge(001) and comparison with the pure Ge(001) substrate studied by 2PPE — Kristof Zielke, •Kamil Bobowski, Cornelius Gahl, and Martin Weinelt — Fachbereich Physik der Freien Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

For submonolayer gold coverage Au/Ge(001) has been shown to form nanowires which exhibit properties typical for a one-dimensional Luttinger liquid [1]. We have investigated the electronic structure of the Au/Ge(001) surface in dependency of gold coverage and annealing temperature by two-photon photoemission spectroscopy (2PPE). While the surface states D_up and D_down of the clean Ge(001) surface are suppressed upon gold adsorption, a new unoccupied state appears about 800 meV above E_F at normal emission. Additionally, time resolved investigations show a significant decrease in excited state lifetimes.

[1] C. Blumenstein et. al., J. Phys.: Condens. Matter 25, 014015 (2013).