Phys. Rev. B 72, 165339 (2005) [8 pages]Singlet and triplet trion states in high magnetic fields: Photoluminescence and reflectivity spectra of modulation-doped CdTe∕Cd0.7Mg0.3Te quantum wellsReceived 25 April 2005; revised 1 August 2005; published 26 October 2005 Photoluminescence (PL) and reflectivity spectra from modulation-doped CdTe∕CdxMg1−xTe quantum well structures containing a two-dimensional electron gas have been studied in magnetic fields up to 45 T. In high fields, the recombination from the dark triplet trion state was found to be one of the most intense PL lines. A “bright” triplet line is revealed in both reflectivity and PL in magnetic fields above 35 T. PL spectra were calculated as a function of magnetic field, taking into account exciton, singlet, and triplet trion states. We show that the intense PL from the dark triplet trion is due to the field-induced suppression of singlet trion formation, and a corresponding enhancement of dark trion formation. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.165339
DOI:
10.1103/PhysRevB.72.165339
PACS:
78.67.De, 71.35.Ji, 73.21.Fg, 78.55.Et
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