Abstract
Singlet and triplet states of negatively (X<sup>-</sup>) and positively (X<sup>+</sup>) charged excitons (trions) in ZnSe-based quantum wells have been studied by means of photoluminescence in pulsed magnetic fields to 50 Tesla. Singlet state binding energies of X<sup>-</sup> show a monotonic increase with growing magnetic fields with a tendency to saturation. Contrary to that a decrease of X<sup>+</sup> binding energy is found. A crossover of the triplet and singlet states is observed in magnetic fields 35 - 50 T.
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