Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 72: Poster Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 72.14: Poster

Wednesday, March 19, 2025, 18:00–20:00, P2

Robustness of Electron-Phonon Coupling Constant With Thermal Variation — •Nour el houda Chetoui, Holger Lange, and Shivani Kesarwani — Institute of Physics and Astronomy, University of Potsdam Karl-Liebknecht-Strasse 24-25, 28.1.029 14476 Potsdam, Germany

The electron-phonon coupling strength of gold is crucial for potential plasmon applications such as photocatalysis. Typically, electron-phonon dynamics is discussed within thermodynamic models with a temperature- independent electron-phonon coupling constant. However, several reports suggest a coupling-strength dependence on the lattice temperature. To put the discussions on a solid basis, we performed transient-absorption spectroscopy on gold nanoparticles from cryogenic to high temperatures to assess the carrier cooling time and the underlying electron-phonon coupling constant. We can work out certain temperature effects and calibrate the bleach intensity to temperature, but observe no temperature dependency on electron-phonon coupling constant at this range.

Keywords: Hot electron dynamics; Electron-phonon coupling constant; Temperature dependence