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Type: Artigo de periódico
Title: On The (200)-zone Boundary Collective Mode In Al Within Nearly-free-electron Degenerate Perturbation Theory
Author: Oliveira L.E.
Sturm K.
Abstract: The Aschroft and Sturm two-band-model on the optical properties of Al is extended for finite k values and the dielectric function ε{lunate}(k,ω) is evaluated for k parallel to the <100 > direction within nearly-free-electron degenerate perturbation theory. It is shown that a pair of (200) Bragg planes gives rise to another pole in the energy loss function Im[-1/ε{lunate}(k,ω)] and hence to a collective mode which is of the same origin as the so-called zone boundary collective mode first proposed by Foo and Hopfield in Na. The dispersion and the strength of this (200)-zone boundary collective mode in Al are evaluated along the <100 > direction and the theoretical results agree very well with electron energy loss spectroscopy data. Comparison is also made with a numerical calculation by Singhal for some discrete k-values. © 1984.
Rights: fechado
Identifier DOI: 10.1016/0038-1098(84)91065-2
Date Issue: 1984
Appears in Collections:Unicamp - Artigos e Outros Documentos

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