Abstract
We have studied the optical properties of surface quantum wells with different width of wells (5 nm and 10 nm) by in-situ photo-modulated reflectance spectroscopy on molecular beam epitaxy (MBE) system. The single surface quantum well (SQW) is confined by the vacuum on one side and by Al 0.3Ga 0.7As barrier on the other side. In experiments, we have observed clearly the transitions from the confined hole states to the confined electron states. The transitions between those excited states in 10 nm surface quantum well are observed for the first time. The effects of the surface on the confined states have been well studied by combination of the PR spectra and the effective mass approximation theory.
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