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Magnetophotoluminescence of negatively charged excitons in narrow quantum wells

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  • T. Vanhoucke
  • M. Hayne
  • M. Henini
  • V. V. Moshchalkov
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Article number125331
<mark>Journal publication date</mark>13/03/2001
<mark>Journal</mark>Physical review B
Issue number12
Volume63
Number of pages8
Pages (from-to)1253311-1253318
Publication StatusPublished
<mark>Original language</mark>English

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.

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© 2001 American Physical Society