Effect of a charge layer on the plasmon-polariton dispersion curve in doped semiconductor superlattices |
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Authors: | G. A. Farias M. M. Auto E. L. Albuquerque P. Fulco |
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Affiliation: | (1) Departamento de Fisica, Universidade Federal do Ceará, 60.450 Fortaleza, CE, Brazil;(2) Departamento de Física, Universidade Federal do Rio Grande do Norte, 59.072 Natal, RN, Brazil |
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Abstract: | We consider the effects of a charge layer (accumulation and depletion layers) on the spectrum of collective plasmon-polariton modes of a semiconductor superlattice consisting of alternating mediaA andB, where mediumA is an-doped semiconductor and mediumB an insulator. The effect of the charge layer is taken into account assuming a linear position dependence for the free-carrier concentration and for the dielectric function, within mediumA. Applications are made considering mediumA asn-type semiconductor and mediumB being vacuum. We compare our results with those obtained in the abscence of the charge layer and we discuss their differences. |
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