III-Nitride quantum dots have emerged as a new chip-scale system for quantuminformation science, which combines electrical and optical interfaces on asemiconductor chip that is compatible with non-cryogenic operatingtemperatures. Yet most work has been limited to optical excitations. To enablesingle-spin based quantum optical and quantum information research, wedemonstrate here quantized charging in optically active, site-controlledIII-Nitride quantum dots. Single-electron charging was confirmed by the voltagedependence of the energy, dipole moment, fine structures and polarizationproperties of the exciton states in the quantum dots. The fundamental energystructures of the quantum dots were identified, including neutral and chargedexcitons, fine structures of excitons, and A and B excitons. The results laythe ground for coherent control of single charges in III-Nitride QDs, opening adoor to III-Nitride based spintronics and spin-qubit quantum informationprocessing.
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