Abstract
We report the observation of umklapp Raman scattering of phonons with wavevector of 2 nπ d in GaAs-Ga 1−xAl xAs superlattices with period d, due to resonance enhancements at transitions from valence band to conduction band minibands. We also observed, for the first time, minizone formation in the spin-orbit split valence band.
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