Condensation of Indirect Excitons in Coupled Alas/Gaas Quantum-Wells

The photoluminescence (PL) of excitons confined in an electric field tunable coupled AlAs/GaAs quantum well has been investigated at T>350 mK and magnetic field H<14 T. In the indirect regime when electrons and holes are separated both in real- and in k-space, magnetic field was found to result in (i) a strong change of both the PL intensity and decay time which is attributed to the anomalies in the exciton transport and (ii) an appearance of a huge broad band noise in the PL intensity which is an evidence of exciton condensation.