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Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 85: Ultrafast Electron Dynamics at Surfaces and Interfaces II: New Methods and Developments

O 85.8: Talk

Thursday, April 4, 2019, 16:45–17:00, H16

Excitation and decay mechanisms in the quantum-well state system Pb/Ag(111) — •Florian Haag1,2, Tobias Eul1, Mirko Cinchetti3, Martin Aeschlimann1, and Benjmain Stadtmüller1,21Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany — 2Graduate School of Excellence Materials Science in Mainz, Erwin Schroedinger Straße 46, 67663 Kaiserslautern, Germany — 3Experimentelle Physik VI, Technische Universität Dortmund, 44221 Dortmund, Germany

Hetero-metallic bilayer systems have developed into a highly tunable class of materials where the electronic properties can be controlled by the interaction across the interface. However, the implementation of low dimensional materials in new nanoscale devices is limited by the comprehension of the hot carrier dynamics of such materials.

Here, we focus on the quantum-well state system of one monolayer Pb on a Ag(111) single crystal. Using light with different polarizations, we are able to identify three different states at the Pb-Ag interface with characteristic momentum dependent lifetimes. Furthermore, we performed time-resolved 2-photon momentum microscopy (tr-2PMM) measurements with a phase stabilized interferometer to obtain information about the excitation pathways and decay mechanisms at the hetero-metallic bilayer system to extend todays understanding of the electron dynamics in low dimensional systems.

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