Abstract
Magneto-photoluminescence spectroscopy measurements were performed on self-assembled InGaAs/GaAs quantum rings. We report exciton exchange energy as a function of interband emission energy; we measure a decrease from 163 mu eV to 43 mu eV in the range of 1.30 eV to 1.40 eV. This result is remarkable and compatible with the exciton exchange energy in self-assembled InAs/GaAs quantum dots. Our results reveal the high value of exciton exchange albeit the quantum rings shape. We show that the exciton energy is sensitive to a magnetic field.