Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Poster Ultrafast Electron Dynamics

O 23.20: Poster

Montag, 17. März 2025, 18:00–20:00, P2

Influence of ballistic electrons on temperature equilibration in bulk gold — •Lukas Jonda, Tobias Held, Markus Uehlein, Christopher Seibel, Sebastian T. Weber, and Baerbel Rethfeld — Department of Physics andResearch Center OPTIMAS, RPTU Kaiserslautern-Landau

During femtosecond laser irradiation of gold, electrons are excited to a state of non-equilibrium in space and energy. Highly excited electrons transport energy ballistically into the bulk due to their relatively long mean free path. On a picosecond timescale, electrons transfer energy to the crystal lattice via electron-phonon collisions.

The objective of this study is to analyze the influence of non-equilibrium electrons on energy transport. Therefore, a two-temperature model will be coupled with a kinetic Monte Carlo simulation. With the former we describe diffusive transport as well as the electron-phonon equilibration, while the latter describes the primary electron excitation by the laser pulse, secondary electron generation, and transport of non-equilibrium electrons above the Fermi level.

Keywords: non-equilibrium electrons; diffusive transport; ballistic transport