论文标题
基于拓扑铁的超导体中的异常志巴态
Anomalous Shiba states in topological iron-based superconductors
论文作者
论文摘要
我们演示了在基于铁的超导体FESE $ _ {1-X} $ TE $ _X $中的磁性杂质的强大零能模式的形成。我们发现，由杂质产生的Zeeman场有利于旋转三个轨道间的轨道间配对，而不是在大块中普遍存在的旋转式轨道内配对。首选的自旋三键配对可保留时间反转对称性，并且是拓扑，并且在具有不同配对状态的区域之间的边界上出现了强大的拓扑保护的零模式。此外，零模式形成了对自旋极化方向或杂质之间分离的方向不敏感的kramers双线。我们认为，我们的理论结果与FESE $ _ {1-X} $ TE $ _X $的最新实验测量一致。
We demonstrate the formation of robust zero energy modes close to magnetic impurities in the iron-based superconductor FeSe$_{1-x}$Te$_x$. We find that the Zeeman field generated by the impurity favors a spin-triplet inter-orbital pairing as opposed to the spin-singlet intra-orbital pairing prevalent in the bulk. The preferred spin-triplet pairing preserves time-reversal symmetry and is topological, as robust, topologically-protected zero modes emerge at the boundary between regions with different pairing states. Moreover, the zero modes form Kramers doublets that are insensitive to the direction of the spin polarization or to the separation between impurities. We argue that our theoretical results are consistent with recent experimental measurements on FeSe$_{1-x}$Te$_x$.
