Abstract
The resonant Raman and polarization behavior were measured for ternary compound Al 0.7Ga 0.3As prepared by molecular beam epitaxy. A one dimensional linear chain model is proposed to calculate the behavior of short wavelength optical phonons. By using the concept of random element isoamplitude instead of random element isodisplacement and by using a pair of asymmetric effective force constants to describe the total effect to polarized field and short range interaction, the calculated results fit well the data. The observed disorder activated optical modes are attributed to the optical phonons at the Brillouin zone edges.
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