Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 33: Poster Tuesday: Ultrafast Processes 2

O 33.10: Poster

Dienstag, 6. September 2022, 11:00–13:00, P3

Density-dependent electron-phonon coupling in multiband systems. — •Tobias Held, Sebastian T. Weber, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany

If a solid is irradiated with a short-pulsed laser in the visible spectrum, the energy is almost entirely absorbed by the electrons while the lattice remains cold. The subsequent energy flow between electrons and phonons is usually described by the electron-phonon coupling parameter, which plays a central role in the Two-Temperature Model and most other temperature-based models. This coupling parameter depends on a multitude of observables. Most frequently a dependence on the electron temperature is considered.
In this work, we aim to investigate how a varying density distribution between different electron subsystems affects the coupling parameter. In gold, we distinguish between sp- and d-electrons and in magnetic nickel between majority and minority spins. Our results show that for gold, the total coupling strongly depends on the density distribution, while for nickel it is largely independent on the spin densities. In the latter case, the individual coupling contributions of the bands change significantly with density but mostly compensate each other in terms of the total coupling.