Abstract
Intersubband transitions in GaAs/GaAlAs multiquantum wells (QW) under hydrostatic pressure have been investigated with photomodulated transmission spectroscopy and free-standing QW samples. In addition to the direct transitions associated with the Γ critical points, several L-related transitions between the L conduction band and the Γ valence band of the GaAlAs barriers and between the L conduction subbands and the Γ valence subbands inside the GaAs quantum wells are observed. The distinct L-related spectral features are a clear indication that photomodulated transmission is particularly useful for enhancement of the weak phonon-assisted indirect transitions.
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