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Compositional Dependences of Critical Point Phonons in Mixed Zincblende Crystals
Author(s) -
Jahne E.,
Ulrici B.
Publication year - 1980
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.2221010118
Subject(s) - phonon , condensed matter physics , semiconductor , interpolation (computer graphics) , point (geometry) , function (biology) , physics , critical point (mathematics) , materials science , quantum mechanics , mathematics , geometry , motion (physics) , classical mechanics , evolutionary biology , biology
The compositional dependences of long‐ and short‐wavelength critical point phonons in mixed zincblende semiconductors are studied within the framework of an interpolation scheme between the end‐member compound phonons which is founded by an “averaged Green's function” technique. The derived dependences on composition agree with those expected from a model with three virtual atoms per unit‐cell (pseudo‐unit cell model). Explicit results are presented for the compositional dependences of the Γ, X, and L point phonons in In 1− x Ga x P and Gap 1− x As x and compared with experimentally derived phonon frequencies.