ЖЭТФ, Том 119,
Вып. 5,
стр. 966 (Май 2001)
(Английский перевод - JETP,
Vol. 92, No 5,
p. 840,
May 2001
доступен on-line на www.springer.com
)
COULOMB EFFECTS IN DYNAMICS OF POLAR LATTICES
Falkovsky L.A.
Поступила в редакцию: 16 Ноября 2000
PACS: 63.20.-e, 78.30.-j
Zone-center phonon frequencies of polar lattices are calculated for uniaxial crystals from the symmetry arguments. Long-range Coulomb forces and crystal anisotropy are explicitly taken into account. Free-carrier contributions into the dielectric constant are included. The angular dispersion of optical-phonon modes is compared with data for hexagonal 6H-SiC polytype.
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