Abstract
In quantum well (QW) structures, it was demonstrated that a single photoluminescence (PL) peak breaks into multiple ones because of the formation, of interface islands with the size larger than the ex- citon radius,1 Within the laser focal area, the relative total area of the islands is small. After absorption takes place, at low temperatures the excitons will occupy the states at interface islands, which have the lowest energy. As a result, it is possible to completely fill exciton states in these islands at relatively low intensities, i.e., the band-filling effect, which manifests as the saturation of the PL peaks and the blue shift of the transition energy, similar to conventional QW structures in Ref. 2. Recently we have observed band filling of the exciton states at interface islands in multiple QWs.3 This occurs at the spatially localized islands because of the spatial confinement of the excitons along the interface. Here we report our experimental observation of enhanced band-filling effect at interface islands in a strongly coupled two-QW sample based on continuous-wave PL and PL excitation (PLE) measurements. The sample was grown by molecular- beam epitaxy on a semi-insulating AlAs substrate.
© 1996 Optical Society of America
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