Abstract
We present a study of spin relaxation of excitons in a set of nominally undoped GaAs/AlGaAs quantum well (QW) structures by using time-resolved photoluminescence techniques. The initial polarization and the spin relaxation time have been measured varying the excitation energy between the heavy- and light-hole exciton of each well, at a temperature of 4 K. Typical spin relaxation times in the 50–120 ps range are found when increasing the well width from 25 to 90 Å; however no dependence of the spin relaxation time on the excitation wavelength has been observed.
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