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O: Fachverband Oberflächenphysik
O 13: Ultrafast Electron Dynamics at Surfaces and Interfaces II
O 13.4: Talk
Monday, March 18, 2024, 16:00–16:15, MA 041
Spatio-Temporal Electron Propagation Dynamics in Au/Fe/MgO(001) in Nonequilibrium: A Random Walk Simulation — •Markus Heckschen1, Yasin Beyazit1, Elaheh Shomali1, Florian Kühne1, Jesumony Jayabalan1, Ping Zhou1, Detlef Diesing2, Markus E. Gruner1, Rossitza Pentcheva1, Axel Lorke1, Björn Sothmann1, and Uwe Bovensiepen1 — 1Fakultät für Physik, Universität Duisburg-Essen and CENIDE, Duisburg D-47048, Germany — 2Fakultät für Chemie, Universität Duisburg-Essen and CENIDE, Essen D-45711, Germany
Electron transport in metals can be either ballistic, superdiffusive or diffusive. We analyze time resolved two-photon photoelectron emission (2PPE) spectroscopy performed in a back-pump front-probe geometry on MgO/Fe/Au which provides information about the nonequilibrium electron distribution as a function of time, energy and Au layer thickness [1].
Here, we present a trajectory-based Monte-Carlo simulation of classical, quasiballistic electrons that undergo inelastic electron-electron scattering. Our simulation reproduces well the experimentally observed 2PPE spectra and allows us to identify high-energy electrons passing ballistically through the sample, as well as low-energy electrons which are transported in a superdiffusive manner.
[1] M. Heckschen et al., PRX Energy 2, 043009 (2023).
Keywords: transport; electron-electron scattering; time resolved; random-walk simulation; energy relaxation