Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-06-14
Physical Review B 72 (2005) 115410
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
18 pages, 5 figures; few minor changes
Scientific paper
10.1103/PhysRevB.72.115410
We determine the lifetime of the surface plasmon in metallic nanoparticles under various conditions, concentrating on the Landau damping, which is the dominant mechanism for intermediate-size particles. Besides the main contribution to the lifetime, which smoothly increases with the size of the particle, our semiclassical evaluation yields an additional oscillating component. For the case of noble metal particles embedded in a dielectric medium, it is crucial to consider the details of the electronic confinement; we show that in this case the lifetime is determined by the shape of the self-consistent potential near the surface. Strong enough perturbations may lead to the second collective excitation of the electronic system. We study its lifetime, which is limited by two decay channels: Landau damping and ionization. We determine the size dependence of both contributions and show that the second collective excitation remains as a well defined resonance.
Jalabert Rodolfo A.
Molina Alfaro R.
Weick Guillaume
Weinmann Dietmar
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