Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 57: Ultrafast Electron and Spin Dynamics
O 57.3: Poster
Dienstag, 21. März 2017, 18:30–20:30, P2-EG
Ultrafast electron dynamics in single crystals studied by time-resolved two-photon momentum microscopy — •Tobias Eul1, Florian Haag1, Benjamin Frisch1, Philip Thielen1, Martin Piecuch1, 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
Electron dynamics in solid state systems and at interfaces play a crucial role for the performance of nanoscale spintronic devices. Therefore, it is essential to investigate the electron dynamics in the materials used for such devices.
The inelastic lifetimes of electronic states can be directly obtained with time resolved two-photon photoemission, using a cross-polarized pump-probe setup. Combining this technique with momentum spectroscopy in a ToF-PEEM operated in K-space mode, we are able to observe the energy dependent electron dynamics for each point in the accessible momentum space. This allows us to analyze cross-correlation traces for different intermediate state energies and different positions in the kx/ky-plane. As first model systems, we focused on bulk states of simple noble metal surfaces using different angles of incide of laser light. Based on the observed behavior, we aim to tune the electron lifetime of the metal surface by adsorption of organic molecules