We present the results of photoluminescence experiments on the negatively charged exciton X- in GaAs/AlxGa1-xAs quantum wells (QW) in high magnetic fields (<~ 50 T). Three different QW widths are used here: 100, 120, and 150 Å. All optically allowed transitions of X- are observed, enabling us to experimentally verify its energy-level diagram. All samples behave consistently with this diagram. We have determined the binding energy Eb of the singlet and triplet state of X- between 23 and 50 T for the 120 and 150 Å QW, while only the triplet Eb is observed for the 100 Å QW. A detailed comparison with recent theoretical calculations shows an agreement for all samples across this entire field range.
First experimental observation of 'dark' and 'bright' triplets of the negatively-charged trion. Measured binding energies of all trion states (singlet, dark & bright triplets) confirmed the theory of W'js et al. PRB 62, 4630 (2001), resolving a controversy. International collaboration. 27 citations. RAE_import_type : Journal article RAE_uoa_type : Physics ©2001 The American Physical Society