A critical point analysis of two phonon structure in the far infrared dielectric response of GaAs
Abstract
The technique of asymmetric Fourier transform spectroscopy has been used to determine the complex relative permittivities of undoped GaAs at frequencies near the transverse optic mode. It is demonstrated that the anharmonic damping function calculated from these results is sensitive to two phonon processes excited by the anharmonic decay of the q≃O transverse optic phonon. Critical-point phonon frequencies are assigned from the structure revealed in damping function.
- Publication:
-
International Journal of Infrared and Millimeter Waves
- Pub Date:
- July 1984
- DOI:
- 10.1007/BF01009589
- Bibcode:
- 1984IJIMW...5.1009M
- Keywords:
-
- Dielectric Properties;
- Far Infrared Radiation;
- Gallium Arsenides;
- Infrared Spectroscopy;
- Phonons;
- Damping;
- Fourier Transformation;
- Optics;
- far infrared;
- dielectric function;
- anharmonic damping function;
- critical-point