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Acoustic and Optical Deformation Potentials in Cubic IV‐VI Compounds
Author(s) -
Enders P.
Publication year - 1985
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221320117
Subject(s) - brillouin zone , lattice (music) , hamiltonian (control theory) , condensed matter physics , deformation (meteorology) , finite strain theory , materials science , optics , physics , molecular physics , mathematics , thermodynamics , composite material , acoustics , finite element method , mathematical optimization
Abstract Acoustic and optical deformation potentials (DP) in cubic IV‐VI compounds are calculated by diagonalizing the p‐model Hamiltonian including finite lattice distortions at the L‐ and T‐points of the Brillouin zone. A very pronounced and even non‐monotonous dependence is found of some DP upon the very lattice deformation and, most surprisingly, Ξ 2 (L) < 0 for the optical DP. This may explain the wide variance of experimental data for different samples and experimental conditions.