Abstract

We report experimental studies of absorption spectra of two-dimensional electron gases (2DEGs) in a GaAs/AlAs mixed-type quantum well (MTQW) structure. The 2DEGs are induced and the corresponding Landau level filling factor is controlled through optical excitations of the narrow well in the MTQW. In an external magnetic field normal to the quantum well plane, the absorption spectra of the 2DEGs are characterized by both exciton and trion resonances. As the filling factor approaches 1, exciton resonances are quenched, while a strong trion resonance persists. These properties make 2DEGs in MTQWs a promising ensemble spin system for pursuing electromagnetically induced transparency and related applications in semiconductors.

© 2014 Optical Society of America

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