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

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

2009-07-09

arxiv.org/abs/0907.1649v2

Phys. Rev. B 81, 161309(R) (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.81.161309

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.

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