The Coulomb Effects in the Dynamics of Polar Lattices
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.
- Publication:
-
Soviet Journal of Experimental and Theoretical Physics
- Pub Date:
- May 2001
- DOI:
- 10.1134/1.1378176
- arXiv:
- arXiv:cond-mat/0101050
- Bibcode:
- 2001JETP...92..840F
- Keywords:
-
- Condensed Matter - Materials Science
- E-Print:
- 9 pages, 1 figure, to be published in JETP, issue 5, 2001