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We demonstrate the optical addressability of the spin of an individualChromium atom (Cr) embedded in a semiconductor quantum dot. The emission ofCr-doped quantum dots and their evolution in magnetic field reveal a largemagnetic anisotropy of the Cr spin induced by local strain. This results in thezero field splitting of the 0, +-1 and +-2 Cr spin states and in athermalization on the magnetic ground states 0 and +-1. The observed strongspin to strain coupling of Cr is of particular interest for the development ofhybrid spin-mechanical devices where coherent mechanical driving of anindividual spin in an oscillator is needed. The magneto-optical properties ofCr-doped quantum dots are modelled by a spin Hamiltonian including thesensitivity of the Cr spin to the strain and the influence of the quantum dotsymmetry on the carrier-Cr spin coupling.

Individual Cr atom in a semiconductor quantum dot: optical addressability and spin-strain coupling