Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 85: Ultrafast Electron Dynamics at Surfaces and Interfaces II: New Methods and Developments
O 85.7: Vortrag
Donnerstag, 4. April 2019, 16:30–16:45, H16
Momentum dependent hot electron dynamics in Ag(110) — •Tobias Eul1, Eva-Sophia Walther1, Michael Hartelt1, Eva Prinz1,2, Benjamin Frisch1, Mirko Cinchetti3, Martin Aeschlimann1, and Benjamin Stadtmüller1,2 — 1Department of Physics and Research Center Optimas, University of Kaiserslautern, Germany — 2Graduate School MAINZ, Germany — 3Experimentelle Physik IV, TU Dortmund University, Germany
Electron dynamics in solid state systems and at interfaces play a crucial role for the performance of nanoscale electronic and spintronic devices. Therefore, it is essential to investigate hot electrons and the corresponding energy and momentum dissipation mechanisms in such materials.
To go beyond the energy dissipation mechanisms, we combine the well-established time-resolved two-photon photoemission technique with ToF-momentum microscopy (PEEM operated in k-space mode). From our data set, we extract and analyze cross-correlation traces for different intermediate state energies at each point of the accessible momentum space, which can be directly translated into momentum dependent lifetime maps.
Here, we focused on single crystalline Ag(110), where we observe lifetime differences of several femtoseconds, which can be correlated to the character of the optical transition as well as to the excited state dynamics of the band structure. Our first results already point to a complex momentum dependent lifetime of electrons even for simple material systems.