Excitonic Aharonov–Bohm effect in QD-on-ring nanostructures

We show by the first-order perturbation theory and the configuration interaction method that the Coulomb interaction in quantum rings mixes electron–hole pair states with the same total angular momentum, which makes it difficult to observe a clear excitonic Aharonov–Bohm (A–B) effect. To avoid this situation, we propose the use of a combined structure of a quantum dot on the top of a quantum ring with an applied static electric field. Under moderate experimental conditions with respect to the applied electric and magnetic fields, we show that we can observe the excitonic A–B effect due to the reduction of the Coulomb interaction and an increase in the difference between the average radii of the electron and hole trajectories.