Abstract
The effect of a transverse magnetic field on circularly polarized free exciton photoluminescence of ultra-high-purity AlGaAs layers (Hanle effect) has been investigated. An unusual shape of the Hanle curves was found. The Hanle curve is a superposition of two Lorentzian contours, the widths of which differ approximately by a factor of 10. Two additional maxima are situated symmetrically relative to zero magnetic field. The superposition of Lorentzian contours is explained by depolarization of free excitons, formed via geminate and bimolecular processes, respectively. The effect of depolarization of free electrons taking place before binding in excitons is also taken into account. The origin of the weak satellite peaks is unclear up to now.
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