Measuring the spin polarization of a ferromagnet: An application of time-reversal invariant topological superconductor
Measuring the spin polarization of a ferromagnet: An application of time-reversal invariant topological superconductor
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DOI：
10.1209/0295-5075/111/47002
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发表时间：
2014-11
期刊：
影响因子：
--
通讯作者：
Zhongbo Yan;S. Wan
中科院分区：
文献类型：
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作者：
Zhongbo Yan;S. Wan
铁磁体的自旋极化是自旋电子学中一个非常重要的物理量。在这项工作中，我们提出了一个准一维结结构的FM和时间反转不变的拓扑超导体（TRITS）的非自旋极化配对类型，以确定SP的FM。我们发现，由于TRITS的拓扑性质，FM/TRITS结的零偏置电导（ZBC），这是直接相关的SP是一个非量子化的量，但拓扑性质。ZBC只依赖于FM的参数，与FM和超导体之间的界面散射势和费米面失配无关，并且对磁邻近效应具有鲁棒性，因此，与传统的FM/s波超导结相比，ZBC的拓扑性质使得该装置成为一种更直接和简化的确定SP的方法。
The spin polarization (SP) of the ferromagnet (FM) is a quantity of fundamental importance in spintronics. In this work, we propose a quasi–one-dimensional junction structure composed of a FM and a time-reversal invariant topological superconductor (TRITS) of un-spin-polarized pairing type to determine the SP of the FM. We find that due to the topological property of the TRITS, the zero-bias conductance (ZBC) of the FM/TRITS junction which is directly related to the SP is a non-quantized quantity but of topological nature. The ZBC only depends on the parameters of the FM, it is independent of the interface scattering potential and the Fermi surface mismatch between the FM and the superconductor, and is robust against the magnetic proximity effect; therefore, compared to the traditional FM/s-wave superconductor junction, the topological property of the ZBC makes this setup a much more direct and simplified way to determine the SP.