Abstract
The wave-function localization on a single-monolayer length scale is studied by magnetophotoluminescence in GaSb quantum wells of thickness ranging between 5 and 40 ML. The excitonic effects are found to be important only in the low-field range (B<2 T), whereas free-carrier localization dominates at higher field values. Variational calculations of the excitonic transverse extension provide a quantitative description of the experimental data. The high sensitivity of the magnetoluminescence to the modifications of the wave function, even on the scale of a single monolayer, has been used to deduce experimentally the dependence of the effective reduced mass on the well width.
- Received 1 June 1995
DOI:https://doi.org/10.1103/PhysRevB.52.R11591
©1995 American Physical Society