A Possible Mechanism of a Low-Energy Plasmon Excitation in Metals

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We reconsider the possibility of the existence of the acoustic plasmon using a sinpie model. The previously employed models for the prediction of the acousticplasmon assume that two overlapping conduction bands with light and heavy massesindependently give an electron-gas like form of the dielectric response function. Thenew model takes account of the complete mixing of the two conduction bands andassumes an approximate form of the dielectric response function which has a contribution from both interband and intraband transitions, involving a few adjustableparameters describing the relative intensities and positions of the two transitions. Itisfound that in the strict sense of the terminology the acoustic plasmon does not exist inthe limit of small wavenumbers, but the optical plasmon of the conduction electronscan be reduced to one tenth of its original value estimated from the density of the con-duction electrons under the influence of the interband transition.acoustic plasmon, optical plasmon, transition metal]
社団法人日本物理学会の論文
1991-02-15