Shot noise spectrum of artificial Single Molecule Magnets: measuring spin-relaxation times via the Dicke effect

TL;DR

This paper theoretically analyzes shot noise in an artificial Single Molecule Magnet, revealing how the Dicke effect enables extraction of spin relaxation times, with implications for various magnetic systems.

Contribution

It introduces a novel frequency-resolved shot noise measurement method to separately determine spin relaxation times in S=5/2 systems, inspired by the Dicke effect.

Findings

Super-Poissonian shot noise due to Mn-hole exchange anisotropy

Identification of a Dicke-like effect in shot noise spectra

Potential application to other S>1/2 magnetic systems

Abstract

We investigate theoretically shot noise in an artificial Single Molecule Magnet based upon 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 behaviour. We report on a novel 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 S>1/2 systems including transport through Mn(12) molecules and STM spectroscopy of magnetic atoms.