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Magneto-photoluminescence of negatively charged excitons in narrow quantum wells

Research output: Contribution to journalJournal article

Published

  • Tony Vanhoucke
  • Manus Hayne
  • Mohamed Henini
  • Victor V Moshchalkov
Journal publication date13/03/2001
JournalPhysical Review B
Journal number12
Volume63
Pages125331
Original languageEnglish

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.

Bibliographic note

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