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Non‐Linear Dipole Effects in the Infra‐Red Absorption of GaAs
Author(s) -
Borik H.
Publication year - 1970
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.19700390116
Subject(s) - anharmonicity , dipole , moment (physics) , absorption (acoustics) , coupling constant , infrared , phonon , chemistry , absorption spectroscopy , bond dipole moment , transition dipole moment , atomic physics , molecular physics , physics , condensed matter physics , optics , quantum mechanics , organic chemistry
The IR absorption spectrum of GaAs is calculated and a good agreement with the measured bands is achieved. A considerable part of the two phonon bands is due to second order dipole moment absorption. The simplest kind of a model for cubic anharmonicity and the second order dipole moment has proved to work satisfactorily. The constant ratio between dipole and anharmonic coupling coefficients characteristic for this type of interaction is represented in terms of optical constants and the static ionic charge. The difference between an effective value for this ratio taken from the IR data and the one valid for the short range type of coupling coefficients is of reasonable magnitude.