Abstract
Internal transitions of confined hydrogenic excitons in type-I multiple-quantum-well structures have been observed and studied as a function of magnetic field (0–15 T) and quantum well width (80–200 Å). A highly sensitive technique that combines visible and far infrared methods, optically detected resonance spectroscopy, was employed, and revealed several internal excitonic transitions, with the transition dominant. The energies of the transition vs magnetic field are in very good agreement with variational calculations for the 80 and 125 Å wells. The strength of the intraexcitonic features was observed to be much weaker in the 200 Å well-width samples.
- Received 21 February 1996
DOI:https://doi.org/10.1103/PhysRevLett.77.1135
©1996 American Physical Society