Correlated spin currents generated by resonant-crossed Andreev reflections in topological superconductors.
Correlated spin currents generated by resonant-crossed Andreev reflections in topological superconductors.
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DOI：
10.1038/ncomms4232
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发表时间：
2014
影响因子：
16.6
通讯作者：
Law, K. T.
中科院分区：
文献类型：
--
作者：
He, James J.;Wu, Jiansheng;Choy, Ting-Pong;Liu, Xiong-Jun;Tanaka, Y.;Law, K. T.
支持马约拉纳费米子激发的拓扑超导体由于其新颖的输运特性及其在容错量子计算中的潜在应用而成为深入研究的主题。在这里，我们提出了一种新型拓扑超导体，可以用作相关自旋电流的新源。我们证明，在 AIII 类拓扑绝缘体线上诱导超导性，尊重手性对称性并支持受保护的费米子端态，将产生拓扑超导体。这种拓扑超导体支持分别具有一个或两个马约拉纳费米子端态的两个拓扑相。在具有两个马约拉纳费米子的相位中，由于马约拉纳引起的共振交叉安德烈夫反射，超导体可以有效地将库珀对分裂成两个空间分离的引线中的电子。引线中产生的电流是相关的并且是自旋极化的。重要的是，所提出的拓扑超导体可以使用靠近超导体的量子反常霍尔绝缘体来实现。 具有拓扑保护电子结构的材料有望促进更高效的自旋电子器件的开发。他等人。建议将量子反常霍尔绝缘体与超导体相结合可用于产生相关自旋电流。
Topological superconductors, which support Majorana fermion excitations, have been the subject of intense studies due to their novel transport properties and their potential applications in fault-tolerant quantum computations. Here we propose a new type of topological superconductors that can be used as a novel source of correlated spin currents. We show that inducing superconductivity on a AIII class topological insulator wire, which respects a chiral symmetry and supports protected fermionic end states, will result in a topological superconductor. This topological superconductor supports two topological phases with one or two Majorana fermion end states, respectively. In the phase with two Majorana fermions, the superconductor can split Cooper pairs efficiently into electrons in two spatially separated leads due to Majorana-induced resonant-crossed Andreev reflections. The resulting currents in the leads are correlated and spin-polarized. Importantly, the proposed topological superconductors can be realized using quantum anomalous Hall insulators in proximity to superconductors. Materials that exhibit topologically protected electronic structures are expected to enable the development of more efficient spintronic devices. He et al. suggest that combining a quantum anomalous Hall insulator with a superconductor could be used to generate correlated spin currents.
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