Spin-induced charge correlations in transport through interacting quantum dots with ferromagnetic leads

Details Spin-induced charge correlations in transport through interacting quantum dots with ferromagnetic leads Spin-induced charge correlations in transport through interacting quantum dots with ferromagnetic leads

2009-03-10

arxiv.org/abs/0903.1759v2

Phys. Rev. B 79, 245303 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

published version, 8 pages, 7 figures

Scientific paper

10.1103/PhysRevB.79.245303

We study the full counting statistics of electronic transport through a single-level quantum dot weakly coupled to two leads, with either one or both of them being ferromagnetic. The interplay of Coulomb interaction and finite spin polarization implies spin-correlation induced charge correlations that give rise to super-Poissonian transport behavior and positive cross correlations of the currents of the two spin species. In the case of two ferromagnetic leads, we analyze the nontrivial dependence of the cumulants on the angle between the polarization directions of the leads. We find diverging second and higher cumulants for spin polarizations approaching unity.

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