Surface Spectral Functions and Excitation Frequencies in Thin Metallic Films (CROSBI ID 110344)
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Despoja, Vito ; Marušić, Leonardo ; Šunjić, Marijan
engleski
Surface Spectral Functions and Excitation Frequencies in Thin Metallic Films
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 $\varepsilon _{; ; ; ; p}; ; ; ; ({; ; ; ; \bf Q}; ; ; ; , \omega )$ for the thin jellium slab within the Random Phase Approximation, using Kohn-Sham wavefunctions within 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.
metalic slab; spectrum; collective excitations; LDA; GW
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