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Trends in the plasmon dispersion of insulators and semiconductors

Journal of Physics C: Solid State Physics, ISSN: 0022-3719, Vol: 18, Issue: 6, Page: 1191-1196
1985
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Article Description

Starting from the dielectric function of a two-band model, a generalised Horie formula for the wavevector-dependent frequency, ω(q), of the valence plasmon is derived. The dispersion is determined by band-structure effects and the q-dependence of the oscillator strength. The latter is calculated using kp perturbation theory. An estimate is derived, indicating a positive dispersion for semiconductors and a negative one for insulators, in agreement with experimental findings. © 1985 The Institute of Physics.

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