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 X S − and of X are in inverse proposition to B, revealing the effect and the mechanism of the magnetic confinement of X S − and of the excitonic shrinkage on the emission intensity.