Plasmonic excitations in noble metals: The case of Ag

Physical Review B 61, 8033 - 8042 (2000)

Plasmonic excitations in noble metals: The case of Ag

M.A. Cazalilla, J.S. Dolado, A. Rubio, P.M. Echenique

The delicate interplay between plasmonic excitations and interband transitions in noble metals is described by means of 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, especially the energy at which the excitation of the d-like bands takes place, determine the existence of a threshold plasmonic mode, which manifests itself in Ag as a sharp resonance experimentally observed at 3.8 eV. However, such a resonance does not appear in the spectra of the other noble metals. Here this different behavior is also analyzed, and an explanation is provided.

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http://dx.doi.org/10.1103/PhysRevB.61.8033

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