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Few-electron systems confined in a quantum dot laterally coupled to asurrounding quantum ring in the presence of an external magnetic field arestudied by exact diagonalization. The distribution of electrons between the dotand the ring is influenced by the relative strength of the dot and ringconfinement, the gate voltage and the magnetic field which induces transitionsof electrons between the two parts of the system. These transitions areaccompanied by changes in the periodicity of the Aharonov-Bohm oscillations ofthe ground-state angular momentum. The singlet-triplet splitting for a twoelectron system with one electron confined in the dot and the other in the ringexhibits piecewise linear dependence on the external field due to theAharonov-Bohm effect for the ring-confined electron, in contrast to smoothoscillatory dependence of the exchange energy for laterally coupled dots in theside-by-side geometry.Comment: to appear in PRB in August 200

Electron spin and charge switching in a coupled quantum-dot–quantum ring system