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Article Dans Une Revue New Journal of Physics Année : 2003

Nonequilibrium electron energy-loss kinetics in metal clusters

Résumé

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.

Dates et versions

hal-00342473 , version 1 (27-11-2008)

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C. Guillon, Pierre Langot, N. del Fatti, F. Vallée. Nonequilibrium electron energy-loss kinetics in metal clusters. New Journal of Physics, 2003, 5, pp.13.1. ⟨10.1088/1367-2630/5/1/313⟩. ⟨hal-00342473⟩
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