Size-Dependent Surface Plasmon Dynamics in Metal Nanoparticles
Abstract
We study the effect of Coulomb correlations on the ultrafast optical dynamics of small metal particles. We demonstrate that a surface-induced dynamical screening of the electron-electron interactions leads to quasiparticle scattering with collective surface excitations. In noble-metal nanoparticles, it results in an interband resonant scattering of d-holes with surface plasmons. We show that this size-dependent many-body effect manifests itself in the differential absorption dynamics for frequencies close to the surface plasmon resonance. In particular, our self-consistent calculations reveal a strong frequency dependence of the relaxation, in agreement with recent femtosecond pump-probe experiments.
Cite
@article{arxiv.cond-mat/9805163,
title = {Size-Dependent Surface Plasmon Dynamics in Metal Nanoparticles},
author = {T. V. Shahbazyan and I. E. Perakis and J. -Y. Bigot},
journal= {arXiv preprint arXiv:cond-mat/9805163},
year = {2009}
}
Comments
8 pages + 4 figures, final version accepted to PRL