Unique properties of $\mathrm{ZnO}$ quantum rings

Electronic states and optical transitions of a $\mathrm{ZnO}$ quantum ring containing few interacting electrons in an applied magnetic field are found to be very different from those in a conventional semiconductor system, such as a $\mathrm{GaAs}$ ring. Strong Zeeman and Coulomb interactions of the $\mathrm{ZnO}$ system, exert a profound influence on the electron states and on the optical properties of the ring. In particular, our results indicate that the Aharonov–Bohm effect in a $\mathrm{ZnO}$ quantum ring strongly depends on the electron number.