Single vanadium ion magnetic dopant in an individual CdTe/ZnTe quantum dot

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Photoluminescence spectrum of CdTe/ZnTe quantum dot containing single vanadium dopant.

We present the basic properties of a physical system: an individual V2+ ion embedded into an individual quantum dot. The system is realized utilizing molecular beam epitaxy and it is observed using a low-temperature polarization-resolved magnetophotoluminescence. The nature of the system is confirmed by observation of the excitonic lines split due to the interactions of a vanadium ion with carriers confined in a CdTe/ZnTe quantum dot. Observed data are explained by the numerical modeling which includes an 𝑠,𝑝−𝑑 exchange interaction, Zeeman splitting of the exciton and the ion, a diamagnetic shift, and the presence of shear strain within the quantum dot. The fundamental state of vanadium exhibits a spin ±1/2, making this system a textbook localized qubit.