Plasmonic excitations in noble metals: The case of Ag

Details Plasmonic excitations in noble metals: The case of Ag Plasmonic excitations in noble metals: The case of Ag

1999-07-14

arxiv.org/abs/cond-mat/9907204v1

Phys. Rev. B 61, 8033 (2000).

Physics

Condensed Matter

Materials Science

9 pages, 8 figures

Scientific paper

10.1103/PhysRevB.61.8033

The delicate interplay between plasmonic excitations and interband transitions in noble metals is described by means of {\it ab initio} calculations and a simple model in which the conduction electron plasmon is coupled to the continuum of electron-hole pairs. Band structure effects, specially the energy at which the excitation of the $d$-like bands takes place, determine the existence of a subthreshold plasmonic mode, which manifests itself in Ag as a sharp resonance at 3.8 eV. However, such a resonance is not observed in the other noble metals. Here, this different behavior is also analyzed and an explanation is provided.

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