Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 63: Poster Wednesday: Ultrafast Processes

O 63.3: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B1

Energy-resolved measurement and simulation of hot electron transport in Au/Fe/MgO(001) — •Jan Beckord¹, Yasin Beyazit¹, John Thomas¹, Ping Zhou¹, Detlef Diesing², Uwe Bovensiepen¹, and Manuel Ligges¹ — ¹Faculty of Physics, University of Duisburg-Essen, 47048 Duisburg, Germany — ²Faculty of Chemistry, University of Duisburg-Essen, 45141 Essen, Germany

We have established a new time-resolved, two-photon photoemission (tr-2PPE) technique, where the sample is pumped from the back side through a transparent substrate and subsequently probed from the front side. We apply this technique to Au/Fe/MgO(001) samples with various gold thicknesses and obtain energy-resolved transport velocities from the temporal shifts of the tr-2PPE signal. To understand the influence of the hot electron lifetimes in Au and Fe and other experimental parameters on these time shifts, we simulate the ballistic transport equation in this particular system both analytically and numerically. The simulation is then compared to our experimental results to extract the energy-dependent ballistic velocities. Our obtained values are consistent with previous, not energy-resolved measurements and comparable to theoretical values predicted from band-structure calculations. This study was funded by the DFG through SFB1242.