Observation of the zero-magnetic-field exciton spin splitting in high quality bulk GaAs and AlGaAs

We present an experimental study of the zero-magnetic-field exciton spin splitting measured by time-resolved photoluminescence in high purity bulk GaAs and AlGaAs samples. The dynamics of the splitting differs from that observed in two dimensions. Initially, the splitting increases during 100-250 ps...

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Bibliographic Details
Published in:Applied physics letters 2009-11, Vol.95 (18), p.182107-182107-3
Main Authors: Kozhemyakina, E. V., Zhuravlev, K. S., Amo, A., Ballarini, D., Viña, L.
Format: Article
Language:English
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Summary:We present an experimental study of the zero-magnetic-field exciton spin splitting measured by time-resolved photoluminescence in high purity bulk GaAs and AlGaAs samples. The dynamics of the splitting differs from that observed in two dimensions. Initially, the splitting increases during 100-250 ps and then decays. This initial increase is attributed to the fast rise of the density of excitons formed from noncorrelated e - h pairs. The splitting dynamics is used to determine the exciton formation time, which is found to vary with excitation density from 70 to 360 ps.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3257369