Trion confinement and exciton shrinkage in the 2DEG at high magnetic fields

We study the photoluminescence from the negatively charged (X−) trions and neutral (X) excitons, in a diluted 2DEG in a magnetic field (B) up to 55 T. At zero B we analyze the evolution of the X− and X   emission intensity, tuning it through the optical depletion effect. At non-zero field we find that the emission intensity of the singlet state of the trion XS− and of X are in inverse proposition to B  , revealing the effect and the mechanism of the magnetic confinement of XS− and of the excitonic shrinkage on the emission intensity.

► Charged excitons are candidates for application in quantum information spin-based quantum devices. ► Photoluminescence experiments at liquid helium temperature in pulsed magnetic fields. ► Charged exciton's magnetic confinement and shrinkage elucidated in a quantum confined system. ► The interplay between disorder and Coulomb interactions in the 2DEG reveals new interaction-related effects.