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

G. V. Astakhov, D. R. Yakovlev, V. V. Rudenkov, P. C. M. Christianen, T. Barrick, S. A. Crooker, A. B. Dzyubenko, W. Ossau, J. C. Maan, G. Karczewski, and T. Wojtowicz
Phys. Rev. B 71, 201312(R) – Published 31 May 2005

Abstract

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.

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  • Received 15 April 2005

DOI:https://doi.org/10.1103/PhysRevB.71.201312

©2005 American Physical Society

Authors & Affiliations

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

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Issue

Vol. 71, Iss. 20 — 15 May 2005

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