Magneto-Optical Spectroscopy Of Excitons And Trions In Charge-Tunable Quantum Dots

We investigated the magneto-optical properties of charge-tunable GaAs quantum dots (QDs). Photoluminescence (PL) spectra change greatly with charge states of the QDs, and the PL lines of excited trions show complex magnetic field dependencies, which are quite different from that of the lowest radiative trion. A simulation using the configuration-interaction method supports the assignment of the PL emissions, and the effects of electron-electron and electron-hole interactions on shell and spin configurations of excited trions are discussed.