Abstract
We have studied microscopic structures of two different interfaces in MBE-grown GaAs–AlxGa1-xAs quantum wells (QWs), and effects of growth interruption on the interface roughness. For QWs with x>0.5, the effective roughness of top (AlGaAs-on-GaAs) interfaces is drastically reduced down to less than 0.2 atomic layer by the growth interruption, whereas bottom (GaAs-on-AlGaAs) interfaces are unaffected and act as pseudo-smooth interfaces even without the interruption. However, for QWs with x<0.3, bottom interfaces are similar to top interfaces, and can be smoothed by the growth interruption. Microscopic models of various heterointerfaces are presented.
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