Magnetism induced by nonlocal spin-entangled electrons in a superconducting spin-valve
Magnetism induced by nonlocal spin-entangled electrons in a superconducting spin-valve
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超导自旋阀中非局域自旋纠缠电子诱导的磁性
DOI：
10.1088/1367-2630/aaf4a8
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发表时间：
2016-11
影响因子：
3.3
通讯作者：
Jinbin Yao
中科院分区：
文献类型：
--
作者：
Hao Meng;Jiansheng Wu;Xiuqiang Wu;Mengyuan Ren;Yajie Ren;Jinbin Yao
传统的观点认为，在非共线磁化的超导体（S）铁磁体（F）异质结构中，出现在超导区的磁矩是由等自旋三重态超导关联引起的。本文提出在NSF 1 F2（N-正常金属）自旋阀结构中，S区和N区的感生磁矩也可以通过库珀对分裂产生：一个电子相干地从S层隧穿到F1层，另一个电子留在S层或隧穿到N层.两个电子在空间上彼此分离，但它们的总自旋基态在这个过程中纠缠。相反，由等自旋三重态关联引起的磁矩几乎不从S层穿透到N层。特别地，通过调节交换场的大小和F1层的厚度，可以控制N层中的感应磁矩的方向。这一有趣的现象可以归因于自旋纠缠电子产生的相移。我们的理论建议将提供一种有效的方法来控制非局域电子的纠缠，也可以为以前和最近的实验观察提供可能的解释（Stamopoulos et al 2005 Phys. Rev. B 72 212514; Ovsyannikov et al 2016 J. Exp. Theor. 122 738; Flokstra等2016 Nat.Phys.12 57）。
In the traditional view, the magnetic moment appearing in the superconducting region is induced by equal-spin triplet superconducting correlations in superconductor (S) ferromagnet (F) heterostructure with noncollinear magnetization. In this paper, we represent that in NSF 1 F 2 (N-normal-metal) spin-valve structure the induced magnetic moment emerging in both the S and N regions can also be generated by Cooper pair splitting: one electron coherently tunnels from the S layer into the F1 layer, and the other one stays in the S layer or tunnels into the N layer. Two electrons are spatially separated from each other but their total spin ground state is entangled in this process. In contrast, the magnetic moment induced by the equal-spin triplet correlations hardly penetrates from the S layer into the N layer. In particular, by tuning the size of the exchange field and the thickness of the F1 layer, one may control the direction of the induced magnetic moment in the N layer. This interesting phenomenon can be attributed to the phase-shift obtained by the spin-entangled electrons. Our theoretical proposal will offer an effective way to control the entanglement of the nonlocal electrons, and also may provide possible explanations for previous and recent experimental observations (Stamopoulos et al 2005 Phys. Rev. B 72 212514; Ovsyannikov et al 2016 J. Exp. Theor. Phys. 122 738; Flokstra et al 2016 Nat. Phys. 12 57).
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影响因子：
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影响因子：
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