Positive cross-correlations in a three-terminal quantum dot with ferromagnetic contacts

Details Positive cross-correlations in a three-terminal quantum dot with ferromagnetic contacts Positive cross-correlations in a three-terminal quantum dot with ferromagnetic contacts

2003-08-27

arxiv.org/abs/cond-mat/0308564v2

Phys. Rev. Lett 92, 206801 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.92.206801

We study current fluctuations in an interacting three-terminal quantum dot with ferromagnetic leads. For appropriately polarized contacts, the transport through the dot is governed by a novel dynamical spin blockade, i.e., a spin-dependent bunching of tunneling events not present in the paramagnetic case. This leads for instance to positive zero-frequency cross-correlations of the currents in the output leads even in the absence of spin accumulation on the dot. We include the influence of spin-flip scattering and identify favorable conditions for the experimental observation of this effect with respect to polarization of the contacts and tunneling rates.

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