
%0 Journal Article
%A Josefsson, TW 
%A Smith, AE 
%T Local-field Effects in the High-q-vector Dielectric Response of Si
%J Australian Journal of Physics
%D 1993/10/01
%V 46
%N 5
%P 635-646
%K 
%R https://doi.org/10.1071/PH930635
%U https://www.publish.csiro.au/paper/PH930635 
%X The influence of microscopic or local fields on the full frequency- and wavevector-dependent dielectric loss function of Si has been calculated, based on accurate empirical pseudopotential calculations of the electronic structure. It is shown that local-field effects, dramatically significant at optical (q ~ 0) wavevectors, diminish with increasing magnitude of q to negligible proportions as q approaches the Brillouin zone boundary. In addition it is shown that the calculated volume-plasmon dispersion relation is improved in comparison with experimental results by the inclusion of local-field effects. 
