Abstract
We have measured the time-resolved magneto-photoluminescence of mixed type GaAs AlAs quantum wells, in which the electron density can be varied from ∼10 9 to ∼10 11 cm −2. We confirm that as the electron density is increased the precursor of the Mott transition is the trion (negatively charged exciton) and that the transition occurs when the Landau level filling factor v = 2. In zero field the transition is broad and ill-defined, but in a field it is sharp and is accompanied by an abrupt change in linewidth and radiative lifetime.
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