Abstract
The zone-center phonon frequencies of polar lattices are calculated for uniaxial crystals proceeding from the symmetry considerations. The long-range Coulomb forces and crystal anisotropy are explicitly taken into account. The free-carrier contributions to the dielectric constant are included. The angular dispersion of the optical-phonon modes is compared to data for a hexagonal 6H-SiC polytype.
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L. A. Falkovsky, Pis’ma Zh. Eksp. Teor. Fiz. 69, 247 (1999) [JETP Lett. 69, 268 (1999)].
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From Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 119, No. 5, 2001, pp. 966–970.
Original English Text Copyright © 2001 by Falkovsky.
This article was submitted by the author in English.
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Falkovsky, L.A. The Coulomb effects in the dynamics of polar lattices. J. Exp. Theor. Phys. 92, 840–843 (2001). https://doi.org/10.1134/1.1378176
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DOI: https://doi.org/10.1134/1.1378176