论文标题
铁磁杂质在基于铁的超导体中诱导Majora零模式
Ferromagnetic Impurity Induced Majorana Zero Mode in Iron-Based Superconductor
论文作者
论文摘要
最近的实验报道了一些具有拓扑带结构的铁基超导体中与铁磁杂质相关的令人困惑的零能量模式。在这里，我们表明，铁磁杂质和底物之间的足够强的交换耦合可以触发量子相变，除此之外，围绕杂质的拓扑表面超导顺序参数的相位可获得杂质的签名变换。在这种情况下，我们证明可以在分隔两个标志变化方案的边界上诱导kramers归化对的模式，并围绕拓扑表面超导状态的杂质。此外，我们表明我们的理论可以解释一些基于铁的超导体中最近实验的零能量模式的有争议的观察和混淆特征。
Recent experiments reported the puzzling zero energy modes associated with ferromagnetic impurities in some iron-based superconductors with topological band structures. Here, we show that the sufficiently strong exchange coupling between a ferromagnetic impurity and substrate can trigger a quantum phase transition, beyond which, the phase of the topological surface superconducting order parameter around the impurity acquires a sign-change. In such a case, we prove that a Kramers degenerate pair of Majorana modes can be induced at the boundary separating the two sign-change regimes and trapped around the impurity in the topological surface superconducting state. Furthermore, we show that our theory can explain the controversial observations and confusing features of the zero energy modes from recent experiments in some iron-based superconductors.
