Original scientific paper

Surface spectral functions and excitation frequencies in thin metallic films

Vito Despoja ; Department of Physics, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
Leonardo Marušić ; Department of Physics, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
Marijan Šunjić ; Department of Physics, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia

Abstract

Surface spectral functions are calculated for very thin metal slabs, containing both collective modes and single-particle excitations. This is achieved by calculating the surface dielectric function εp(Q, ω) for the thin jellium slab in the density functional theory and random phase approximation, using Kohn-Sham wavefunctions within the local density approximation, from which we derive the surface spectral functions. Influence of the slab thickness on the excitation spectra is studied, and the dispersion relations of the collective modes are obtained. Slightly modified fast converging method for the calculation of the Kohn-Sham wavefunctions is presented.

Keywords

surface spectral functions; collective modes; single-particle excitations; KohnSham wavefunctions

Hrčak ID:

302002

URI

https://hrcak.srce.hr/302002

Publication date:

1.5.2005.

Article data in other languages: croatian

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