Far Infrared Studies of Shallow Donors in GaAs-AlGaAs Quantum Wells
Calculations for GaAs-AlGaAs quantum wells show that impurity energies depend strongly on the quantum well (QW) width and/or the impurity position within the well. Recent experimental work in GaAs-AlGaAs MQW structures is reviewed with emphasis on FIR spectroscopic studies of donor impurities in magnetic fields up to 9.5T. Samples nominally doped in narrow regions at the center and the edge of GaAs wells have been studied for QW widths between 80A and 450A. Results are generally in very good agreement with recent calculations. Possible use of these measurements to determine the distribution of impurities is discussed.
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