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- W1978911175 abstract "The wavevector- and frequency-dependent self-consistent field approximation dielectric tensor of an n-type semiconductor with anisotropic, multi-valley and parabolic conduction band is derived taking into account the optical phonon contribution. The high-frequency and long-wavelength form of this tensor, calculated in the degenerate plasma limit, is used for the normal mode analysis. The dispersion equation for the plasmon-phonon modes with long wavelength is found to have an isotropic-like form, epsilon 1(q, omega )=0, except for the case of the lower-frequency mode in the strongly anisotropic, very dense conduction band plasma; epsilon 1(q, omega ) is the appropriate wave-vector-direction-dependent longitudinal dielectric function. The plasmon-phonon modes dispersion relation is established up to terms quadratic in the wavevector and the dependence of the frequencies on the propagation direction is discussed. The dispersibility of the lower-frequency mode has a maximum close to the point where the phonon frequency omega LO is equal to the plasma frequency omega p. Special attention is paid to lead salts and numerical estimates are made for PbTe." @default.
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- W1978911175 date "1981-04-30" @default.
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- W1978911175 title "Dielectric tensor and plasmon-phonon modes in semiconductors with anisotropic conduction valleys" @default.
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- W1978911175 doi "https://doi.org/10.1088/0022-3719/14/12/008" @default.
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