论文标题
近代纳米线中的可控制的非局部自旋极化
Phase-Controllable Nonlocal Spin Polarization in Proximitized Nanowires
论文作者
论文摘要
我们研究了连接到超导铅和铁磁绝缘子（FI）的半导体纳米线（NW）中的磁和超导接近效应。我们表明，由于超导相关性与FI中的交换场之间的相互作用，在NW中出现了相当大的平衡自旋极化。所得的磁化具有非局部贡献，它在NW上扩散在超导相干长度上，并且与正常状态下的磁接近效应引起的局部自旋极化相反。对于约瑟夫森结设置，我们表明非局部磁化可以通过整个连接的超导相位偏置控制。我们的发现与在最先进的混合结构中实施Majorana Bound国家有关。
We study the magnetic and superconducting proximity effects in a semiconducting nanowire (NW) attached to superconducting leads and a ferromagnetic insulator (FI). We show that a sizable equilibrium spin polarization arises in the NW due to the interplay between the superconducting correlations and the exchange field in the FI. The resulting magnetization has a nonlocal contribution that spreads in the NW over the superconducting coherence length and is opposite in sign to the local spin polarization induced by the magnetic proximity effect in the normal state. For a Josephson-junction setup, we show that the nonlocal magnetization can be controlled by the superconducting phase bias across the junction. Our findings are relevant for the implementation of Majorana bound states in state-of-the-art hybrid structures.
