Evidence of Singlet-Triplet Crossing in Photoluminescence of Positively Charged Excitons in GaAs Quantum Wells |
L. Bryja, A. Wójs, J. Jadczak, J. Misiewicz
Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland P. Płochocka, M. Potemski Grenoble High Magnetic Field Laboratory, CNRS, 25 av. Martyrs, F-38042 Grenoble, France D. Reuter and A. Wieck Lehrstuhl fur Festkörperphysik, Ruhr Universität, Universitätstrasse 150, 44780 Bochum, Germany |
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Received: 7 06 2008; |
Positively charged excitons in a two-dimensional hole gas in symmetric and asymmetric GaAs/Ga1-x Alx As quantum wells are studied in polarization-resolved photoluminescence experiments in high magnetic fields B (up to 23 T) and low temperatures (down to 300 mK). The experiments are accompanied by numerical calculations of a real structure. The whole family of trions (the singlet and a pair of triplets) are observed. The Coulomb energies crossing of singlet and triplet is found: hidden in symmetric and visible in asymmetric structures. |
DOI: 10.12693/APhysPolA.114.1073 PACS numbers: 73.20.Mf, 71.35.Ji, 71.35.Pq, 78.20.Ls |