Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 2: Ultrafast Electron Dynamics at Surfaces and Interfaces 1
O 2.4: Vortrag
Montag, 5. September 2022, 11:15–11:30, H3
Ultrafast electron transport across interfaces in Au/Fe/MgO(001) heterostructures — Yasin Beyazit1, Florian Kühne1, Markus Heckschen1, Björn Sothmann1, Elaheh Shomali1, Markus Gruner1, Rossitza Pentcheva1, Ping Zhou1, Detlef Diesing2, and •Uwe Bovensiepen1 — 1Universität Duisburg-Essen, Fakultät für Physik, 47048 Duisburg — 2Universität Duisburg-Essen, Fakultät für Chemie, 45141 Essen
The dynamics of electronic excitations at buried interfaces is decisive in electron transfer and carrier multiplication in heterostructures. Following recent developments in time-resolved two-photon photoemission spectroscopy the relaxation dynamics of optically excited, hot electrons can be distinguished in the individual layers of Au/Fe/MgO(001) by analysis of the Au thickness dependent relaxation times [Beyazit et al., PRL 125, 076803 (2020)]. Here we report on recent experimental results and the separation of the primary, optically excited electrons and the secondary, relaxed and propagating electron distribution. This study is complemented by calculations using the Boltzmann transport equation for the propagation through the Au layer and density functional theory calculations resolving the interface contribution.
Funding by the Deutsche Forschungsgemeinschaft through SFB 1242 is gratefully acknowledged.