Department of Physics, Arizona State University, Tempe, Arizona 85287, USA.
Phys Rev Lett. 2012 Oct 5;109(14):146602. doi: 10.1103/PhysRevLett.109.146602. Epub 2012 Oct 3.
We present a unified formalism of Andreev reflection of a partial polarized current at a ferromagnet/superconductor interface instead of assuming a linear combination of unpolarized and polarized currents. The Andreev reflection is limited by the states of minority spins and the extra majority spins become evanescent wave. We further study the effects of spin polarization, inelastic scattering, and interfacial scattering on the Andreev reflection, normal reflection, and transmitted probabilities in equilibrium as well as under a bias. Our model, which reduces to those of Blonder, Tinkham, and Klapwijk, Mazin, and Dynes in three limiting cases, provides a significantly better description of the experimental results.
我们提出了一种在铁磁体/超导体界面处部分偏振电流的安德烈夫反射的统一形式，而不是假设非偏振和偏振电流的线性组合。安德烈夫反射受到少数自旋态的限制，而额外的多数自旋则成为消逝波。我们进一步研究了自旋极化、非弹性散射和界面散射对平衡以及偏压下安德烈夫反射、正常反射和透射概率的影响。我们的模型在三个极限情况下简化为 Blonder、Tinkham 和 Klapwijk、Mazin 和 Dynes 的模型，为实验结果提供了显著更好的描述。
