Abstract
We study interband optical spectra of GaAs quantum wells as a function of their excess electron density and an applied magnetic field. With increasing electron density we observe a sharp quenching of the neutral excitonic transitions (X), with the concurrent strengthening of a transition to lower energy due to the negatively charged exciton (X −). Application of a magnetic field enhances the second electron binding energy, increasing the separation of X and the ground state of X −, as well as stabilising excited (“triplet”) states of X − where the two electrons have parallel spins.
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