Coulomb effects in dynamics of polar lattices
arXiv:cond-mat/0101050 · doi:10.1134/1.1378176
Abstract
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.
arXiv comment9 pages, 1 figure, to be published in JETP, issue 5, 2001