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TT: Fachverband Tiefe Temperaturen

TT 24: Poster Session: Transport

TT 24.8: Poster

Donnerstag, 30. September 2021, 13:30–16:00, P

Theory of coherent phonon mode excitation in metal nanoparticles — •Robert Salzwedel¹, Dominik Hoeing², Yannic Staechelin², Florian Schulz², Holger Lange², Andreas Knorr¹, and Malte Selig¹ — ¹Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — ²Institut für Physikalische Chemie, Universität Hamburg, 20146 Hamburg, Germany

Metal nanoparticles perform radial breathing mode oscillation upon excitation by a light pulse. Typically, these oscillations are assumed to be driven by the thermalization of hot electrons that impulsively heat the lattice [1,2].

Here we present a hydrodynamic theory based on the Heisenberg equation of motion formalism for the optical excitation of the electron gas in metal nanoparticles and the related electron-phonon interaction.

Our analysis reveals that spatial gradients of the electron density which are induced by the optical pump already drive coherent phonon oscillations whereas thermalization is found to be of reduced importance.
[1] Hodak, J. H. et al. (1999), JOCP, 111(18)
[2] Ng, M. Y. et al. (2011), JOCP, 134(9), 094116