ZhETF, Vol. 119,
No. 5,
p. 966 (May 2001)
(English translation - JETP,
Vol. 92, No. 5,
p. 840,
May 2001
available online at www.springer.com
)
COULOMB EFFECTS IN DYNAMICS OF POLAR LATTICES
Falkovsky L.A.
Received: November 16, 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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