MAGNETOOPTICS OF EXCITONS IN A CENTER SI DELTA-DOPED GAAS ALGAAS QUANTUM-WELL/

Observation of magneto-optical transitions in a Si center delta-doped quantum well is reported. The excitons are stabilized by the applicati on of the field. With photoluminescence excitation spectroscopy (PLE), transitions below the Fermi level are observed. At magnetic fields > 8 T broadened Landau levels can be seen. The features in the PLE spect ra sharpen up significantly when the Larmor diameter becomes less than the average interimpurity spacing. The effect of the ionized donors i n the well on the optical spectra is discussed.