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FIZIKA A 14 (2005) 2, 207 - 218
 
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
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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