Schematic layer structure of the superlattice samples indicating the InP QW, GaAs barrier layer, and the superlattice period. are the thicknesses of the QW and barrier layer and N is the superlattice period.
PR and ER spectra for highly strained superlattice samples (a) S1 and (b) S2. Open circles are Aspnes's line shape fitting of the superlattice feature.
PR and ER spectra for partially relaxed superlattice samples (a) S3, (b) S4, and (c) S5. Open symbols are the Aspnes's line shape fitting. Both the graphs are enlarged along y-axis for clarity in viewing the superlattice features.
SPS spectra for highly strained superlattice structures S1 and S2.
SPS spectra for partially relaxed superlattice structures S3, S4, and S5. For comparison purpose, SPS spectrum of sample S2 is also plotted in the same graph.
InP QW thicknesses, GaAs barrier layer thickness, superlattice period N, and relaxation as determined from high resolution x-ray diffraction measurements. Transition energies of the superlattice feature as determined from room temperature PR and ER measurements.
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