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arXiv 1402.5901cond-mat.mes-hallcond-mat.supr-con
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超导体上反铁磁链中Shiba态的Majorana费米子

Majorana fermions from Shiba states in an antiferromagnetic chain on top of a superconductor

Andreas Heimes, Panagiotis Kotetes, Gerd Schön

摘要:

我们提出了一种新的拓扑超导性机制的基础上的反铁磁有序链的磁性原子的表面上的常规超导体。在弱塞曼场中,衬底中的超导电流产生交错的自旋电流,将预先存在的拓扑未保护的Shiba态转换为Majorana费米子(MF)。这两个实验旋钮可以微调,为应用程序提供具有增强功能的平台。值得注意的是,电子自旋极化的出现边缘MF波函数完全取决于奇偶性的磁矩的数量,这可以作为一个独特的签名的MF。我们介绍了极小模型中的基本概念,并通过基于Shiba状态的微观分析与实验联系起来。

英文摘要:

We propose a new mechanism for topological superconductivity based on an antiferromagnetically ordered chain of magnetic atoms on the surface of a conventional superconductor. In a weak Zeeman field, a supercurrent in the substrate generates a staggered spin-current, which converts the preexisting topologically-unprotected Shiba states into Majorana fermions (MFs). The two experimental knobs can be finely tuned providing a platform with enhanced functionality for applications. Remarkably, the electronic spin-polarization of the arising edge MF wavefunctions depends solely on the parity of the number of magnetic moments, which can serve as a distinctive signature of the MFs. We introduce the basic concepts within a minimal model and make contact with experiments by a microscopic analysis based on the Shiba states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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