Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 43: Inorganic/Organic Interfaces: Electronic Properties I
O 43.5: Talk
Wednesday, March 18, 2015, 11:45–12:00, MA 005
Electronic structure of organic monolayer films on a Pb/Ag(111) surface alloy — •Johannes Seidel1, Norman Haag1, Benjamin Stadtmüller1, Christian Tusche2, Mirko Cinchetti1, Jürgen Kirschner2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle, Germany
The ability to control the electronic properties of organic semiconductors at metal-organic hybrid interfaces is crucial for their applicability in future electronic and spintronic devices. Hence, many studies so far focused on tailoring such interfaces by tuning either the properties of the molecular film or of the organic adsorbates. In this study we will extend this concept by altering properties of the metal substrate, i.e., by tuning the metal-organic interface "from the bottom".
We have studied the electronic valence structure of the interface formed by prototypical organic molecules adsorbed on a Pb/Ag(111) surface alloy by ARPES using a k-space microscope. The Pb/Ag(111) surface alloy shows a distinct spin-texture due to the Rashba-Bychkov effect. Our ARPES data reveals almost identical molecular features in the valence band for molecular monolayer films on Ag(111) and the Pb/Ag(111) surface alloy. However, the band structure of the clean Pb/Ag(111) surface alloy is significantly modified by the molecular adsorption which we attribute to a change in the vertical relaxation of the atomic positions of the surface alloy.