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Light-hole and heavy-hole exciton dynamics in GaAs/AlGaAs multiple quantum wells

Exciton dynamics in quantum wells have been much investigated by using the time-resolved spectroscopic methods for understanding of physical phenomena and possible device applications. Only heavy-hole (hh) exciton dynamics, however, has been of concern to many scientists. We expected that light-hole (lh) exciton in addition to hh exciton provides important information on the exciton dynamics. To our knowledge, we report for the first time the dynamics of lh exciton as well as hh exciton in GaAs/A1GaAs 120 Å and 150 Å multiple quantum wells (MQW). We observed that light-hole exciton has a longer decay time than heavy-hole exciton, which results from the difference of the exciton population factor. We considered the thermal population time to explain the observed exciton dynamics.