Comparison of the quantum confined stark effect for (100)- and (311)A-oriented GaAs/AlGaAs quantum wells using electroreflectance spectroscopy
✍ Scribed by R. Goldhahn; S. Shokhovets; G. Gobsch; V. Nakov; M. Henini; G. Hill
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 186 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0749-6036
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✦ Synopsis
The excitonic subband transitions of (100)- and (311)A-oriented GaAs/AlGaAs single quantum wells (SQW's) are investigated using electroreflectance spectroscopy. The strong Franz-Keldysh-Oscillations arising from the undoped AlGaAs barrier layers are analyzed to determine the field strength within the SQW's directly from the measurements with high accuracy. Both, the orientation-dependent splitting between the first heavy and light hole subbands and their field-induced shifts are compared with the results of (\mathbf{k} \cdot \mathbf{p}) calculations. Best agreement between experiment and theory is obtained for a set of Luttinger parameters corresponding to heavy and light hole masses of (0.55 \mathrm{~m}{0}) and (0.084 \mathrm{~m}{0}), respectively, along the [311] direction.