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

被引:21
作者
Lermé, J
Celep, G
Broyer, M
Cottancin, E
Pellarin, M
Arbouet, A
Christofilos, D
Guillon, C
Langot, P
Del Fatti, N
Vallée, F
机构
[1] CNRS, Spectrometrie Ion & Mol Lab, F-69622 Villeurbanne, France
[2] Univ Lyon 1, F-69622 Villeurbanne, France
[3] CNRS, Ctr Phys Mol Opt & Hertzienne, F-33405 Talence, France
[4] Univ Bordeaux 1, F-33405 Talence, France
关键词
Neural Network; Matrix Element; Nonlinear Dynamics; Noble Metal; Large Time;
D O I
10.1140/epjd/e2005-00107-8
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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.
引用
收藏
页码:199 / 204
页数:6
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