SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 19: Poster: Ultrafast Electron Dynamics at Surface and Interfaces I
O 19.1: Poster
Montag, 27. März 2023, 18:00–20:00, P2/EG
ULTRAFAST TRANSPORT AND ENERGY RELAXATION OF HOT ELECTRONS ON TMDC/Au/Fe/MgO(001) INVESTIGATED BY TIME RESOLVED PHOTOELECTRON SPECTROSCOPY — •Florian Kühne1, Jesumony Jayabalan1, Ping Zhou1, Detlef Diesing2, Stephan Sleziona1, Marika Schleberger1, and Uwe Bovensiepen1 — 1Faculty of Physics and Center for Nanointegration, University of Duisburg-Essen — 2Faculty of Chemistry, University of Duisburg-Essen
Optically excited electrons are of particular interest in solid state physics because analysis of their dynamics allows an understanding of the microscopic interactions. Excited charge carriers in metals and semiconductors relax on a femto- to picosecond timescale due to electron-electron and electron-phonon scattering. Using a back-side pump geometry in time-resolved photoelectron spectroscopy (PES), see Kühne et al., PRR 4, 033239(2022), and Beyazit et al., PRL 125, 076803(2020), we demonstrated the analysis of hot electron transport through metallic heterostructures Au/Fe/MgO(001). By pumping the Fe side by femtosecond laser pulses, hot electrons are excited in the Fe layer and injected into the Au layer. They subsequently propagate to the surface, where they are probed by PES. This work aims to employ these heterostructures as electrodes for photo-excited electrons which are injected into transition metal dichalcogenides. Thereby we aim at an analysis of scattering and propagation of electrons through 2D material layers discerning local and non-local effects. Funding by the DFG through Project No. 278162697 - SFB1242 is gratefully acknowledged.