TITLE

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

AUTHOR(S)
Kozhemyakina, E. V.; Zhuravlev, K. S.; Amo, A.; Ballarini, D.; Viña, L.
PUB. DATE
November 2009
SOURCE
Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p182107
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
45036519

 

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