Adiabatic charge and spin pumping through quantum dots with ferromagnetic leads

Details Adiabatic charge and spin pumping through quantum dots with ferromagnetic leads Adiabatic charge and spin pumping through quantum dots with ferromagnetic leads

2008-02-04

arxiv.org/abs/0802.0422v2

Phys. Rev. B 77, 195320 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 7 figures, published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.77.195320

We study adiabatic pumping of electrons through quantum dots attached to ferromagnetic leads. Hereby we make use of a real-time diagrammatic technique in the adiabatic limit that takes into account strong Coulomb interaction in the dot. We analyze the degree of spin polarization of electrons pumped from a ferromagnet through the dot to a nonmagnetic lead (N-dot-F) as well as the dependence of the pumped charge on the relative leads' magnetization orientations for a spin-valve (F-dot-F) structure. For the former case, we find that, depending on the relative coupling strength to the leads, spin and charge can, on average, be pumped in opposite directions. For the latter case, we find an angular dependence of the pumped charge, that becomes more and more anharmonic for large spin polarization in the leads.

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