Abstract
We report on a spectroscopic study of the lowest-energy electron-hole transitions of the two-dimensional electron gas (2DEG), with a density varied by photoexcitation in GaAs/As quantum wells and under a perpendicularly applied magnetic field B. The transition into the phase consisting of a charged exciton singlet () ground state and neutral exciton (X) excited state occurs at a filling factor ν=1. The relative intensities of the and X transitions measured by photoluminescence excitation at T=2 K, as a function of ν≤1 and of B, are shown to depend on the relative area occupied by the magnetic-field–localized 2DEG and on the reduced orbit of the additional electron bound to . © 1996 The American Physical Society.
- Received 2 May 1996
DOI:https://doi.org/10.1103/PhysRevB.54.10320
©1996 American Physical Society