Coexistence of perfect spin filtering for entangled electron pairs and high magnetic storage efficiency in one setup.
Coexistence of perfect spin filtering for entangled electron pairs and high magnetic storage efficiency in one setup.
复制标题
DOI：
10.1038/srep24417
复制
发表时间：
2016-04-14
影响因子：
4.6
通讯作者：
Wang J
中科院分区：
文献类型：
--
作者：
Ji TT;Bu N;Chen FJ;Tao YC;Wang J
对于纠缠电子对超导自旋电子学，现有的产生纠缠电子对的方案存在两个缺陷。一种是两种不同自旋的纠缠电子对相互混合。二是纠缠产生效率低。本文报道了铁磁绝缘体（FI）/s波超导体/FI结构在窄量子自旋霍尔绝缘体带上的自旋纠缠态。结果表明，该方法不仅可以在较宽的能量范围内产生较高的纠缠电子对，而且可以在没有高自旋极化电子的情况下实现纠缠电子对的理想自旋过滤.此外，反铁磁排列中的左引线和右引线的电流都可以为零，表明具有高磁存储效率的100%隧穿磁阻。因此，纠缠电子对的自旋过滤和高效率的磁存储共存于一个装置中。通过测量隧穿电导和噪声功率，可以从实验上证明这一结果。
For Entangled electron pairs superconducting spintronics, there exist two drawbacks in existing proposals of generating entangled electron pairs. One is that the two kinds of different spin entangled electron pairs mix with each other. And the other is a low efficiency of entanglement production. Herein, we report the spin entanglement state of the ferromagnetic insulator (FI)/s-wave superconductor/FI structure on a narrow quantum spin Hall insulator strip. It is shown that not only the high production of entangled electron pairs in wider energy range, but also the perfect spin filtering of entangled electron pairs in the context of no highly spin-polarized electrons, can be obtained. Moreover, the currents for the left and right leads in the antiferromagnetic alignment both can be zero, indicating 100% tunnelling magnetoresistance with highly magnetic storage efficiency. Therefore, the spin filtering for entangled electron pairs and magnetic storage with high efficiencies coexist in one setup. The results may be experimentally demonstrated by measuring the tunnelling conductance and the noise power.