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Adiabatic charge and spin pumping through quantum dots with ferromagnetic leads

机译:带有铁磁引线的量子点的绝热电荷和自旋泵浦

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摘要

We study the 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 the strong Coulomb interaction in the dot into account. 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, which becomes more and more anharmonic for large spin polarization in the leads.
机译:我们研究了通过附着在铁磁引线上的量子点对电子的绝热泵浦。因此,我们在绝热极限中使用了实时图表技术,该技术考虑了点中的强大库仑相互作用。我们分析了从铁磁体通过点泵送到非磁性导线(N-F)的电子的自旋极化程度,以及泵送电荷对自旋阀相对引线的磁化方向的依赖性(F -dot-F)结构。对于前一种情况,我们发现,取决于与引线的相对耦合强度,平均而言,自旋和电荷可以沿相反的方向泵送。对于后一种情况,我们发现了泵浦电荷的角度依赖性,这对于引线中的大自旋极化变得越来越不谐和。

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