Nonequilibrium electron energy-loss kinetics in metal clusters

Details Nonequilibrium electron energy-loss kinetics in metal clusters Nonequilibrium electron energy-loss kinetics in metal clusters

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003njph....5...13g&link_type=abstract

New Journal of Physics, Volume 5, Issue 1, pp. 13 (2003).

Physics

2

Scientific paper

Ultrafast energy exchanges of a non-Fermi electron gas with the lattice are investigated in silver clusters with sizes ranging from 4 to 26 nm using a femtosecond pump-probe technique. The results yield evidence for a cluster-size-dependent slowing down of the short-time energy losses of the electron gas when it is strongly athermal. A constant rate is eventually reached after a few hundred femtoseconds, consistent with the electron gas internal thermalization kinetics, this behaviour reflecting evolution from an individual to a collective electron-lattice type of coupling. The timescale of this transient regime is reduced in small nanoparticles, in agreement with speeding up of the electron-electron interactions with size reduction. The experimental results are in quantitative agreement with numerical simulations of the electron kinetics.

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