Vanhoucke, T. and Hayne, M. and Henini, M. and Moshchalkov, V. V. (2001) Magnetophotoluminescence of negatively charged excitons in narrow quantum wells. Physical review B, 63 (12): 125331. pp. 1253311-1253318. ISSN 1550-235X
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Abstract
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.