Wellhyphen;width dependence of photoinduced intersubband absorption in GaAs/AlGaAs multi quantum wells

摘要

The photoinduced intersubband absorption of undoped GaAs/Al0.33Ga0.67As multi quantum wells with different well widths is reported. Two different absorption bands are observed in each of the samples. One is polarized along the growth direction, is linear with the pump intensity, and is identified with the intersubband transition of free excitons. The other is not polarized, depends sublinearly on the pump intensity, and is assigned to an intersubband transition which involves interface trapped carriers.