Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 12: Ultrafast Electron and spin dynamics at interfaces II
O 12.8: Vortrag
Montag, 12. März 2018, 17:15–17:30, MA 005
Ultrafast hot electron dynamics of quantum-well states in momentum space — •Florian Haag1, Lisa Grad1, Johannes Seidel1, Norman Haag1, Mirko Cinchetti2, Martin Aeschlimann1, and Benjamin Stadtmüller1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany — 2Experimentelle Physik VI, Technische Universität Dortmund, 44221 Dortmund, Germany
Excited electrons play a crucial role for many fundamental chemical and physical phenomena occurring at surfaces, (hybrid) interfaces, or in bulk materials. Here, we use time-resolved 2 photon momentum microscopy to follow the hot electron dynamics in momentum space and to determine the momentum dependent scattering processes of excited electrons.
As model system, we examined the electron dynamics of the quantum-well system Pb on Ag(111) for different laser polarizations and laser fluencies. The momentum dependent hot electron lifetime can be directly correlated to the band dispersion of the QWS. After adsorption of the organic molecule PTCDA, we find an orbital selective hybridization between molecular levels and QWS as well as a significant increase of the momentum dependent electron lifetime throughout the entire momentum space.