Coulomb effects in dynamics of polar lattices

Details Coulomb effects in dynamics of polar lattices Coulomb effects in dynamics of polar lattices

2001-01-04

arxiv.org/abs/cond-mat/0101050v1

Physics

Condensed Matter

Materials Science

9 pages, 1 figure, to be published in JETP, issue 5, 2001

Scientific paper

10.1134/1.1378176

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 a
dielectric constant are included. The angular dispersion of optical-phonon
modes is compared with data for hexagonal 6H-SiC politype.

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