Microscopic photoluminescence and photoluminescence excitation spectro
scopy are used in order to investigate exciton localization in quasi o
ne dimensional systems such as crescent-shaped AlGaAs/GaAs quantum wir
es grown on a V-grooved substrate. We found that one wire is segmented
into extended sections of hundreds of nanometres with slightly differ
ent confining potentials. Inside these sections one monolayer deep qua
ntum boxes are present on the (001) top facet of the wire with lengths
comparable to the exciton Bohr radius. (C) 1998 Elsevier Science Ltd.
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