FIZIKA A 14 (2005)  2, 207 - 218

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SURFACE SPECTRAL FUNCTIONS AND EXCITATION FREQUENCIES IN THIN METALLIC FILMS

VITO DESPOJA, LEONARDO MARUŠIĆa and MARIJAN ŠUNJIĆ

Department of Physics, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia

aPresent address: Department of Transport and Maritime Studies, University of Zadar, M. Pavlinovića b.b., HR-23000 Zadar, Croatia

Dedicated to the memory of Professor Vladimir Šips

Received 25 October 2005;    Accepted 28 November 2005
Online 7 December 2005

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 ep(Q,w) 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.

PACS numbers: 73.20.-r, 73.20.Mf, 73.21.-b
UDC 538.975

Keywords: surface spectral functions, collective modes, single-particle excitations, Kohn-Sham wavefunctions

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