Long-Wavelength Optical Phonons inGa1−xInxP

Abstract

We report the results of a study, by infrared and Raman spectroscopy, of the long-wavelength ($\overrightarrow{\mathrm{q}}\simeq 0$) optical phonons in the alloy system ${\mathrm{Ga}}_{1-x}{\mathrm{In}}_x\mathrm{P}$. We find one-mode behavior in this diatomic alloy system. Fine structure is also observed and is attributed to disorder-induced one-phonon processes involving shorter-wavelength phonons.