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O: Fachverband Oberflächenphysik

O 58: Poster Session - Ultrafast Electron Dynamics at Surface and Interfaces

O 58.7: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/2OG

Electron-Phonon Coupling in Metals at Elevated Temperatures. — •Tobias Held¹, Sebastian T. Weber¹, Jan Vorberger², and Baerbel Rethfeld¹ — ¹Fachbereich Physik and Research Center OPTIMAS, TU Kaiserslautern — ²Helmholtz-Zentrum Dresden-Rossendorf

In the case of a solid being irradiated by a short-pulsed visible light laser, the energy is almost entirely absorbed by the electrons while the lattice remains cold. The resulting energy flow between electrons and phonons is commonly described by the electron-phonon coupling parameter G_ep in most temperature-based models.
Recent density functional theory (DFT) calculations accompanied by experimental results [1] indicate that a phonon mode-resolved approach is necessary to fully capture the process as opposed to the common assumption that the coupling is dominated by the longitudinal mode.
The coupling parameter can be calculated using analytical methods like a plane-wave approximation [2] as well as via DFT. Here we contrast these approaches and identify each one’s advantages.

[1] L. Waldecker, R. Bertoni, R. Ernstdorfer and J. Vorberger, PRX 6, 021003 (2016)

[2] B. Y. Mueller and B. Rethfeld, PRB 87, 035139 (2013)