Mesoscopic Stoner instability in metallic nanoparticles revealed by shot noise

Details Mesoscopic Stoner instability in metallic nanoparticles revealed by shot noise Mesoscopic Stoner instability in metallic nanoparticles revealed by shot noise

2011-10-12

arxiv.org/abs/1110.2589v3

Phys. Rev. Lett. 108, 166603 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Published version, 5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.108.166603

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.

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