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Article Dans Une Revue The European Physical Journal D : Atomic, molecular, optical and plasma physics Année : 2005

Effects of confinement on the electron and lattice dynamics in metal nanoparticles

Résumé

Effects of confinement on the electron-electron (e-e) and electron-phonon (e-ph) thermalization dynamics in noble metal clusters are calculated using simple approaches. The model predictions are compared with femtosecond pump-probe measurements which display an acceleration of the e-e and e-ph relaxation dynamics. The size-effects on the e-e relaxation dynamics are consistent with a model involving the surface-induced reduction of the screening efficiency of the Coulomb e-e interaction. With regard to the e-ph relaxation dynamics, this model yields too large time constants, pointing out deficiencies of the standard modelling of the e-ph energy exchanges in bulk metals. Analysis of these deficiencies shows that the bare e-ion interaction has to be involved in the transition matrix element describing the non-adiabatic e-ph energy exchanges.

Dates et versions

hal-00342467 , version 1 (27-11-2008)

Identifiants

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J. Lermé, G. Celep, M. Broyer, E. Cottancin, M. Pellarin, et al.. Effects of confinement on the electron and lattice dynamics in metal nanoparticles. The European Physical Journal D : Atomic, molecular, optical and plasma physics, 2005, 34, pp.199. ⟨10.1140/epjd/e2005-00107-8⟩. ⟨hal-00342467⟩
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