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Phys. Rev. B 71, 201312(R) (2005) [4 pages]

Definitive observation of the dark triplet ground state of charged excitons in high magnetic fields

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G. V. Astakhov1,2, D. R. Yakovlev2,3, V. V. Rudenkov4, P. C. M. Christianen4, T. Barrick5, S. A. Crooker5, A. B. Dzyubenko6, W. Ossau1, J. C. Maan4, G. Karczewski7, and T. Wojtowicz7
1Physikalisches Institut der Universität Würzburg, 97074 Würzburg, Germany
2A.F.Ioffe Physico-Technical Institute, Russian Academy of Sciences, 194021, St. Petersburg, Russia
3Experimentelle Physik 2, Universität Dortmund, 44221 Dortmund, Germany
4High Field Magnet Laboratory, Radboud University Nijmegen, 6525 ED Nijmegen, The Netherlands
5National High Magnetic Field Laboratory, Los Alamos, New Mexico 87545, USA
6Department of Physics, California State University at Bakersfield, Bakersfield, California 93311, USA
7Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland

Received 15 April 2005; published 31 May 2005

The ground state of negatively charged excitons (trions) in high magnetic fields is shown to be a dark triplet state, confirming long-standing theoretical predictions. Photoluminescence (PL), reflection, and PL excitation spectroscopy of CdTe quantum wells reveal that the dark triplet trion has lower energy than the singlet trion above 24 T. The singlet-triplet crossover is “hidden” (i.e., the spectral lines themselves do not cross due to different Zeeman energies), but is confirmed by temperature-dependent PL above and below 24 T. The data also show two bright triplet states.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.71.201312
DOI:
10.1103/PhysRevB.71.201312
PACS:
78.66.Hf, 71.35.Ji, 71.35.Pq, 78.67.De
 
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