Majorana bound states in magnetic skyrmions imposed onto a superconductor
Majorana bound states in magnetic skyrmions imposed onto a superconductor
复制标题
DOI：
10.1103/physrevb.100.064504
复制
发表时间：
2019-03
影响因子：
3.7
通讯作者：
S. Rex;I. Gornyi;A. Mirlin
中科院分区：
文献类型：
--
作者：
S. Rex;I. Gornyi;A. Mirlin
考虑了超导薄膜交换耦合到附近的手征磁性层，研究了磁性skyrmions如何诱导超导体中Majorana束缚态的形成。受Yang等人[Phys. Rev. B 93，224505（2016）]的提议的启发，该提议建议在偶数缠绕数的skyrmions中存在MBS，我们探索这样的skyrmions是否可以由普通skyrmions合并产生。我们的结论是，形成更高的绕组skyrmions是不现实的手征磁铁。随后，我们提出了一种可能性，以获得MBS从现实的skyrmion的缠绕数1，如果形成的skyrmion涡对，而不是一个裸露的skyrmion。具体地说，我们表明，MBS支持在一对圆形skyrmion和涡都有一个缠绕数为1。我们备份我们的分析预测与数值对角化的结果，并获得MBS的空间分布。鉴于最近在操纵skyrmions方面的实验进展，此类系统是实现MBS直接空间控制的有希望的候选系统。
We consider a superconducting film exchange-coupled to a close-by chiral magnetic layer and study how magnetic skyrmions can induce the formation of Majorana bound states (MBS) in the superconductor. Inspired by a proposal by Yang et al. [Phys. Rev. B 93, 224505 (2016)], which suggested MBS in skyrmions of even winding number, we explore whether such skyrmions could result from a merger of ordinary skyrmions. We conclude that the formation of higher-winding skyrmions is not realistic in chiral magnets. Subsequently, we present a possibility to obtain MBS from realistic skyrmions of winding number one, if a skyrmion-vortex pair is formed instead of a bare skyrmion. Specifically, we show that MBS are supported in a pair of a circular skyrmion and a vortex which both have a winding number of one. We back up our analytical prediction with results from numerical diagonalization and obtain the spatial profile of the MBS. In light of recent experimental progress on the manipulation of skyrmions, such systems are promising candidates to achieve direct spatial control of MBS.