Mesoscopic Stoner instability in metallic nanoparticles revealed by shot noise

Abstract

We study sequential tunneling through a metallic nanoparticle close to the Stoner instability coupled to parallely magnetized electrodes. Increasing the bias voltage successively opens transport channels associated with excitations of the nanoparticle's total spin. For the current this leads just to a steplike increase. The Fano factor, in contrast, shows oscillations between large super-Poissonian and sub-Poissonian values as a function of bias voltage. We explain the enhanced Fano factor in terms of generalized random-telegraph noise and propose the shot noise as a convenient tool to probe the mesoscopic Stoner instability.

Published version, 5 pages, 3 figures

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• Spin fluctuations in quantum dots
• Transport and semiclassical dynamics of coupled quantum dots interacting with a local magnetic moment
• Statistics of Spin Fluctuations in Quantum Dots with Ising Exchange
• Inelastic electron scattering off a quantum dot in the cotunneling regime: the signature of mesoscopic Stoner instability
• Breaking of Coulomb blockade by macrospin-assisted tunneling
• U(1) and SU(2) quantum dissipative systems: The Caldeira-Leggett vs. the Amegaokar-Eckern-Schön approaches
• Tunneling density of states in quantum dots with anisotropic exchange
• Spin-Noise and Damping in Individual Metallic Ferromagnetic Nanoparticles