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- W2169084883 abstract "The screened Coulomb potential and the inverse dielectric function of a quantum-well double heterostructure (DHS) are expressed in terms of bulk dielectric functions. The spatial dispersion is fully taken into account. The polar LO-phonon modes, longitudinal electronic modes, and coupled electron-phonon modes of a DHS are derived from the poles of the inverse dielectric function. Emphasis is paid to phonon slab modes. The close relation between the screened Coulomb potential and the density-density correlation function is used to calculate the Raman cross section for scattering from charge density fluctuations. In typical cases slab modes are essential for Raman spectra of DHSs and superlattices. Das abgeschirmte Coulomb-Potential und die inverse Dielektrizitätsfunktion einer Quanten-Well-Doppelheterostruktur (DHS) werden durch Volumen-Dielektrizitätsfunktionen ausgedrückt. Die polaren LO-Phonon-Moden, die longitudinalen elektronischen Moden und die gekoppelten Elektron-Phonon-Moden einer DHS werden als Pole der inversen Dielektrizitätsfunktion berechnet. Besondere Beachtung wird den Schicht-Moden geschenkt. Die enge Beziehung zwischen dem abgeschirmten Coulomb-Potential und der Dichte-Dichte-Korrelationsfunktion wird benutzt, um den Raman-Querschnitt für die Sptreuung an Ladungsdichtefluktuationen zu berechnen. In typischen Fällen ist das Raman-Spektrum von DHS und Supergittern wesentlich durch Schichtmoden mit-bestimmt." @default.
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- W2169084883 date "1985-09-01" @default.
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- W2169084883 title "Dielectric Screening, Polar Phonons, and Longitudinal Electronic Excitations of Quantum Well Double Heterostructures Application to Light Scattering from Charge Density Fluctuations" @default.
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- W2169084883 doi "https://doi.org/10.1002/pssb.2221310104" @default.
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