Investigation of L-related indirect transitions in GaAs/GaAIAs multiquantum wells under hydrostatic pressure

Research was conducted to study intersubband transitions in GaAs/GaAIAs multiquantum wells under hydrostatic pressure. Weak indirect transitions were improved by using modulated transmission measurements while several phonon-assisted indirect transitions were resolved on the photo-transmission spectra. Results indicated that phonon-assisted indirect transitions can be significantly improved by the use of the photomodulation technique in transmitting geometry.