Superconducting materials exhibiting topological properties are emerging as an exciting platform to realize fundamentally new excitations from topological quantum states of matter. In this letter, we explore the possibility of a field-free platform for generating Majorana zero energy excitations by depositing magnetic Fe impurities on the surface of candidate topological superconductors, LiFeAs and $\mathrm{PbTaS}{\mathrm{e}}_2$. We use scanning tunneling microscopy to probe localized states induced at the Fe adatoms on the atomic scale and at sub-Kelvin temperatures. We find that each Fe adatom generates a striking zero-energy bound state inside the superconducting gap, which do not split in magnetic fields up to 8 T, underlining a nontrivial topological origin. Our findings point to magnetic Fe adatoms evaporated on bulk superconductors with topological surface states for exploring Majorana zero modes and quantum information science under field-free conditions.

中文翻译：

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具有拓扑表面状态的超导体中类似马约拉那零模式的无场平台

具有拓扑特性的超导材料正在成为一个令人兴奋的平台，可以从根本上从物质的量子量子态实现新的激发。在这封信中，我们探讨了通过在候选拓扑超导体，LiFeAs和LiFeAs的表面上沉积磁性Fe杂质来生成Majorana零能量激发的无场平台的可能性。$\mathrm{铅钽}{\mathrm{Ë}}_2$。我们使用扫描隧道显微镜来探测在原子尺度上和亚开尔文温度下在Fe原子上诱导的局部状态。我们发现，每个Fe原子在超导间隙中都产生一个惊人的零能束缚态，该态在高达8 T的磁场中不会分裂，这说明了一个重要的拓扑起源。我们的发现指向在具有表面拓扑状态的体超导体上蒸发的磁性Fe原子，用于探索无场条件下的Majorana零模式和量子信息科学。