Polarization measurements on Raman spectra of Ga 1− x In x As solid solutions are
performed over a wide energy range (10 cm− 1-600 cm− 1) for several concentrations (x= 0,
0.09, 0.20, 0.40, 0.53, 1). They show that this system follows the so-called “two-mode
behaviour”. The predominance of the GaAs band in the Raman spectra and the large
splitting of the two longwavelength optical GaAs modes over a large range of composition
are correlated to the enhancement of the coupling between the two types of oscillators by …