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arXiv 2107.06558cond-mat.supr-con
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铁基超导体Fe(Te,Se)中相位操纵诱导的Majorana模及其编织实现

Phase-manipulation-induced Majorana Mode and Braiding Realization in Iron-based Superconductor Fe(Te,Se)

Rui Song, Ping Zhang, Ning Hao

摘要:

最近的实验报道了FeSe $_{0.45}$ Te $_{0.55}$中一维Majorana模被晶畴壁捕获的证据。在这里,我们执行的第一性原理计算表明,铁原子在畴壁自发地形成铁磁有序的壁的取向。在适当的畴壁宽度和磁化强度下,铁磁性可以在畴壁分离的表面超导区之间施加$π$相位差。因此,FeSe $_{0.45}$ Te $_{0.55}$的拓扑表面超导态可以产生由壁捕获的一维Majorana模。更有趣的是,我们进一步提出了一种表面结的形式FeSe $_{0.45}$ Te $_{0.55}$ /铁磁体/FeSe $_{0.45}$ Te $_{0.55}$,它可以被用来创建和融合的马约拉纳零模式,通过控制宽度或磁化的内部铁磁屏障。设计的装置可实现马约拉纳零模的编织和读出。这种表面结在超导拓扑量子计算中具有潜在的应用价值。

英文摘要:

Recent experiment reported the evidence of dispersing one-dimensional Majorana mode trapped by the crystalline domain walls in FeSe$_{0.45}$Te$_{0.55}$. Here, we perform the first-principles calculations to show that iron atoms in the domain wall spontaneously form the ferromagnetic order in line with orientation of the wall. The ferromagnetism can impose a $π$ phase difference between the domain-wall-separated surface superconducting regimes under the appropriate width and magnetization of the wall. Accordingly, the topological surface superconducting state of FeSe$_{0.45}$Te$_{0.55}$ can give rise to one-dimensional Majorana modes trapped by the wall. More interestingly, we further propose a surface junction in the form of FeSe$_{0.45}$Te$_{0.55}$/ferromagnet/FeSe$_{0.45}$Te$_{0.55}$, which can be adopted to create and fuse the Majorana zero modes through controlling the width or magnetization of the interior ferromagnetic barrier. The braiding and readout of Majorana zero modes can be realized by the designed device. Such surface junction has the potential application in the superconducting topological quantum computation.

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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