SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 92: Poster Session VII: Ultrafast electron dynamics at surface and interfaces III

O 92.3: Poster

Donnerstag, 4. März 2021, 10:30–12:30, P

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, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany

When a solid is irradiated with a short-pulsed visible light laser, the energy is almost entirely absorbed by the electrons while the lattice remains cold. The subsequent energy flow between electrons and phonons is commonly described by the electron-phonon coupling parameter, a central parameter in the Two-Temperature Model and most other temperature-based models.
This coupling parameter depends on a multitude of variables as reinforced by recent results. The most commonly considered dependence is the one on the electron temperature.
In this work we aim to see how the density distribution between different electronic subsystems affects the coupling parameter in combination with the electronic temperature. For the different electron subsystems we distinguish between orbital types in gold and spins in magnetic nickel. The results show that the total coupling strongly depends on the density distribution for gold, while for nickel the influence is compensated within both bands.