Abstract
Two different types of indirect two-dimensional exciton systems, a real-space indirect coupled quantum well and u new type of real- and k-space indirect GaAs/AlAs quantum structure, are studied hy steady state and time resoved optical spectroscopy. No clear evidence for exciton condensation is found. In the new structure dramatic narrowing of the exciton linewidth in the indirect regime is found and shown to originate from intrinsic confinement effects. A nonmonotonic behavior of the intensity of the indirect photoluminescence as a function of Γ-X separation is tentativily attributed to zone-edge phonon emission.
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