Abstract
The excitation frequency dependence of the Raman spectra in short-period GaAsAlAs superlattices is studied. The off-resonance Raman spectra can be explained by a disorder-induced breakdown of wave-vector conservation leading to the contribution of small magnitude, random orientation wave-vector phonons. As extreme resonance is approached, double-resonance effects cause phonons with large magnitude, preferentially in-plane wave-vectors to dominate the Raman spectrum.
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