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dc.contributor.authorJoão da Providência,
dc.contributor.authorBarberán Falcón, Núriacat
dc.description.abstractStarting from the action principle, a bulk plasmon dispersion relation is obtained. We work with Slater determinants built of plane waves and consider a Hermitian generator of plasma oscillations (with well-defined q momentum) S=αQ-βP, where Q= tsum j cos(q⋅ x j ) is a time-even Hermitian generator, P=scrB tsum j [ p j ⋅q sin(q⋅ x j )+sin(q⋅ x j ) p j ⋅q] is a time-odd Hermitian generator, α(t) and β(t) are real time-dependent functions, and scrB is a real normalization constant. If the parameters α and β are small, the amplitude of the plasma oscillations generated by S is small. The quantum-mechanical action principle leads, in the harmonic approximation, to a quadratic Lagrangian L ( 2 ) (α,β) from which the dispersion relation is obtained. The nonlocal expression of the exchange contribution is explicitly obtained. The resulting bulk plasmon dispersion relation is related to the energy-weighted and cubic-energy-weighted sum rules. Finally, we compare our results with the experimental data.-
dc.publisherThe American Physical Societyeng
dc.relation.isformatofReproducció digital del document publicat en format paper, proporcionada per PROLA i
dc.relation.ispartofPhysical Review B, 1992, vol. 45, núm. 12, p. 6935-6937.eng
dc.rights(c) The American Physical Society, 1992eng
dc.sourceArticles publicats en revistes (Física Quàntica i Astrofísica)-
dc.subject.classificationPlasmons (Física)cat
dc.subject.classificationRelacions de dispersiócat
dc.subject.otherPlasmons (Physics)eng
dc.subject.otherDispersion relationseng
dc.titleNonlocal exchange effects on the bulk plasmon dispersion relationeng
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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