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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

DJVU (52.3K) PDF (209.4K)

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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