Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-05-15
Phys. Rev. B 74, 165421 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
15 pages, 8 figures; version accepted in PRB
Scientific paper
10.1103/PhysRevB.74.165421
The electronic environment causes decoherence and dissipation of the collective surface plasmon excitation in metallic nanoparticles. We show that the coupling to the electronic environment influences the width and the position of the surface plasmon resonance. A redshift with respect to the classical Mie frequency appears in addition to the one caused by the spill-out of the electronic density outside the nanoparticle. We characterize the spill-out effect by means of a semiclassical expansion and obtain its dependence on temperature and the size of the nanoparticle. We demonstrate that both, the spill-out and the environment-induced shift are necessary to explain the experimentally observed frequencies and confirm our findings by time-dependent local density approximation calculations of the resonance frequency. The size and temperature dependence of the environmental influence results in a qualitative agreement with pump-probe spectroscopic measurements of the differential light transmission.
Ingold Gert-Ludwig
Jalabert Rodolfo A.
Weick Guillaume
Weinmann Dietmar
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