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We present a theory and experiment demonstrating optical readout of chargeand spin in a single InAs/GaAs self-assembled quantum dot. By applying amagnetic field we create the filling factor 2 quantum Hall singlet phase of thecharged exciton. Increasing or decreasing the magnetic field leads toelectronic spin-flip transitions and increasing spin polarization. Theincreasing total spin of electrons appears as a manifold of closely spacedemission lines, while spin flips appear as discontinuities of emission lines.The number of multiplets and discontinuities measures the number of carriersand their spin. We present a complete analysis of the emission spectrum of asingle quantum dot with N=4 electrons and a single hole, calculated andmeasured in magnetic fields up to 23 Tesla.

Optical readout of charge and spin in a self-assembled quantum dot in a strong magnetic field