Two-way photoeffectlike occupancy dynamics in a single (InGa)As quantum dot

We extend optical spin-noise spectroscopy on single (InGa)As quantum dots to high magnetic fields at which the splitting between the two optically active Zeeman branches of the positively charged quantum dot trion transition is significantly larger than the homogeneous linewidth. Under such conditions, the standard theoretical approximations concerning the decoupling of spin and charge dynamics are generally not valid anymore, and the Kerr rotation fluctuations show significantly richer detuning-dependent features in the spectral region between the two Zeeman-split resonances. A comparison of the experimental data with an extended theory suggests that the typical Auger recombination can be neglected at high magnetic fields in favor of a probe-laser-induced photoeffect that not only shuffles the resident hole out of the quantum dot but also activates acceptor-bound holes, which recharge the empty quantum dot.