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Electron energy-loss spectroscopy on metallic superlattices

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JournalJournal of physics c-Solid state physics
DatePublished - 10 Aug 1987
Issue number22
Volume20
Number of pages15
Pages (from-to)3321-3335
Original languageEnglish

Abstract

A theory of electron scattering by longitudinal plasmons in binary metallic super-lattices is considered. The theory is based on the dispersive hydrodynamic jellium model applied to both superlattice components. This allows a straightforward derivation of the dispersion relation and permits the quantisation of the superlattice longitudinal plasmon field. For application to electron energy-loss spectroscopy (EELS) the coupling of this field to electrons is taken as the canonically transformed interaction Hamiltonian which readily incorporates the effects of the finite screening lengths of the superlattice metallic components. For a typical metallic superlattice the cross section as a function of energy loss is derived, and is shown to predict a number of scattering peaks corresponding to zone-folded longitudinal plasmons due to the superlattice macroscopic periodicity. It is suggested here that an experiment employing conventional EELS techniques should reveal this folding of longitudinal plasmons in metallic superlattices.

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