Singlet and triplet states of charged excitons in ZnSe-based QWs probed by high magnetic fields

摘要

Singlet and triplet states of negatively (X~-) and positively (X~+) 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~- show a monotonic increase with growing magnetic fields with a tendency to saturation. Contrary to that a decrease of X~+ binding energy is found. A crossover of the triplet and singlet states is observed in magnetic fields 35-50 T.