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Size-Dependent Surface Plasmon Dynamics in Metal Nanoparticles

T. V. Shahbazyan·I. E. Perakis·J. -Y. Bigot
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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.

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T. V. Shahbazyan, I. E. Perakis, J. -Y. Bigot. 1998-08-25. Size-Dependent Surface Plasmon Dynamics in Metal Nanoparticles. https://doi.org/10.1103/physrevlett.81.3120

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