We use photoluminescence spectroscopy to investigate the ground state of single self-assembled InGaAs lateralquantum dot molecules. We apply a voltage along the growth direction that allows us to control the total chargeoccupancy of the quantum dot molecule. Using a combination of computational modeling and experimentalanalysis, we assign the observed discrete spectral lines to specific charge distributions. We explain the dynamicprocesses that lead to these charge configurations through electrical injection and optical generation. Our systemicanalysis provides evidence of interdot tunneling of electrons as predicted in previous theoretical work.
展开▼
