We examine the ballistic conduction through Au-NiMnSb-Au heterostructures consisting of up to four units of the half-metallic NiMnSb in the scattering region, using density functional theory (DFT) methods. For a single NiMnSb unit the transmission function displays a spin polarization of around $50\%$ in a window of $1\mathrm{eV}$ centered around the Fermi level. By increasing the number of layers, an almost complete spin polarization of the transmission is obtained in this energy range. Supplementing the DFT calculations with local electronic interactions, of Hubbard-type on the Mn sites, leads to a hybridization between the interface and many-body states. The significant reduction of the spin polarization seen in the density of states is not apparent in the spin polarization of the conduction electron transmission, which suggests that the hybridized interface and many-body induced states are localized.

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通过相关的Au-NiMnSb-Au异质结构自旋极化弹道传导

我们使用密度泛函理论（DFT）方法研究了通过Au-NiMnSb-Au异质结构的弹道传导，该异质结构由散射区域中多达四个单元的半金属NiMnSb组成。对于单个NiMnSb单元，传输函数显示出大约为的自旋极化$50％$ 在一个窗口 $\mathrm{1个}\mathrm{电子伏特}$以费米水平为中心。通过增加层数，在该能量范围内可获得透射的几乎完全自旋极化。用锰位点上的哈伯德型的局部电子相互作用补充DFT计算，会导致界面状态与多体状态之间发生杂化。在态密度中看到的自旋极化的显着降低在传导电子传输的自旋极化中并不明显，这表明杂化界面和多体感应态是局部的。