Time-resolved photoluminescence from wide parabolic GaAs/ AlxGa1− xAs quantum wells in high magnetic fields

Abstract

We report on time-resolved photoluminescence (PL) from the quasi-three-dimensional electron gas in remotely-doped wide parabolic GaAs/ Al x Ga 1− x As quantum wells in magnetic fields up to 18 T. The magnetic field dependence and the decay times of the PL indicate an excitonic character in spite of the doping. In magnetic fields, an additional peak appears at higher energy in all the samples studied. At At T = 0.06 K, the decay time of the lower energy peak increases considerably above an onset field, while that of the higher energy peak remains inchanged. We considered possible effects of electron/hole localization on the PL lifetime changes.