Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 79: Poster: Ultrafast Electron and Spin Dynamics at Interfaces
O 79.2: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Momentum dependent hot electron lifetimes in metals — •Tobias Eul1, Florian Haag1,3, Philip Thielen1,3, Martin Feidt1, Mirko Cinchetti2, Martin Aeschlimann1, and Benjamin Stadtmüller1,3 — 1Fachbereich Physik and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany — 2Experimentelle Physik VI, Technische Universität Dortmund, Germany — 3Graduate School MAINZ, Germany
Understanding the correlation between the electronic band structure and the corresponding hot carrier dynamics is of utmost importance to improve the performance of next-generation electronic and spintronic devices. In this context, we will combine momentum microscopy with two-photon photoemission to directly image the momentum dependent electron dynamics of 2D materials and metal-organic systems.
In a first step, we have chosen to study the electron dynamics of noble metals with the combination of our photoemission electron microscope with a time-of-flight detector. The experimental data obtained by time-resolved two-photon momentum microscope can be used to directly translate the transient photoemission yield into intermediate state lifetimes.
For Ag single crystals, we observe a clear momentum dependence of the electron lifetimes for all intermediate state energies. These findings are discussed in the light of static one and two photon momentum microscopy experiments which allow us to characterize the electronic states involved in the optical excitation process.