Abstract
We have measured the dispersion of of GaAs/As asymmetric coupled-quantum-well (ACQW) structures in the region of room-temperature excitonic resonances. The spectrum of has sharp and strong peaks including the transitions which are allowed by selection rule in a symmetric quantum well (SQW) as well as the transition which is forbidden in a SQW. The peak value of (2ω) of the ACQW which we measured is ten times larger than that of bulk GaAs.
- Received 2 January 1991
DOI:https://doi.org/10.1103/PhysRevB.43.12477
©1991 American Physical Society