Surface collective excitations in ultrafast pump-probe spectroscopy of metal nanoparticles

T. V. Shahbazyan; I. E. Perakis

doi:10.1016/s0301-0104(99)00311-0

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arXiv · cond-mat/0001376

Surface collective excitations in ultrafast pump-probe spectroscopy of metal nanoparticles

T. V. Shahbazyan·I. E. Perakis

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Abstract

The role of surface collective excitations in the electron relaxation in small metal particles is studied. It is shown that the dynamically screened electron-electron interaction in a nanoparticle contains a size-dependent correction induced by the surface. This leads to new channels of quasiparticle scattering accompanied by the emission of surface collective excitations. In noble-metal particles, the dipole collective excitations (surface plasmons) mediate a resonant scattering of d-holes to the conduction band. The role of this effect in the ultrafast optical dynamics of small nanoparticles is studied. With decreasing nanoparticle size, it leads to a strong change in the differential absorption lineshape and a strong frequency dependence of the relaxation near the surface plasmon resonance. The experimental implications of these results in ultrafast pump-probe spectroscopy are addressed. The size-dependence of conduction electron scattering rates is also discussed.

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T. V. Shahbazyan, I. E. Perakis. 2000-01-25. Surface collective excitations in ultrafast pump-probe spectroscopy of metal nanoparticles. https://doi.org/10.1016/s0301-0104(99)00311-0

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