Shot noise spectrum of artificial single-molecule magnets: Measuring spin relaxation times via the Dicke effect

We investigate theoretically shot noise in an artificial single-molecule magnet based on a CdTe quantum dot doped with a single $S=5/2$ Mn spin and gated in the hole sector. Mn-hole exchange anisotropy is shown to lead to profound consequences on noise like super-Poissonian behavior. We report on a distinct effect, similar to the Dicke effect in Quantum Optics, that allows to separately extract the hole and Mn spin relaxation times using frequency-resolved shot noise measurements. We expect that our findings may have further relevance to experiments in other $Sg1/2$ systems including transport through ${\text{Mn}}_{12}$ molecules and scanning tunnel microscope spectroscopy of magnetic atoms.