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Arrhenius plot of the carrier concentration measured in the van der Pauw geometry for samples A3, A1, and A4, as indicated. The activation energies fit to the data over the entire temperature range (solid lines) are 30, 37, and for A3, A1, and A4, respectively.
Intersubband absorption spectra of samples A1 and A3 measured for various temperatures between 300 and . (The spectra are shown with offset for clarity.)
Comparison of the sheet carrier density freeze-out obtained from Hall measurements (solid circles) with the temperature dependence of the intersubband absorption in sample A3. The integrated intensity of the higher-energy intersubband absorption peak, (open squares), is independent of temperature while that of the lower-energy peak, (open circles), follows the electron freeze-out seen in the Hall measurements.
Description of samples. is an AlP well width and is a GaP barrier width. and are sheet carrier density per well and carrier mobility, specified at 300 and , as indicated.
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