We study odd-parity nematic superconductivity in doped topological insulators in the presence of surface magnetic impurities. The peculiar surface subgap spectrum, characterized by a Majorana flat band, nodal cones, and the surface states of the parent topological insulator, gives rise to overall ferromagnetic RKKY interactions between the surface impurities. An additional coupling between the impurities and a preemptive chiral order parameter promote a surface time-reversal symmetry breaking solution at the surface of the system. We discuss the relevant scenarios and suggest to engineer surface chiral superconductivity by properly choosing magnetic adatoms with highly anisotropic exchange coupling.

中文翻译：

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具有磁性杂质的奇偶性向列超导体中的表面手性超导

我们在存在表面磁性杂质的情况下研究了掺杂拓扑绝缘体中的奇偶校验向列超导性。独特的表面亚隙谱以马约拉纳半岛的平坦带，节锥和母体拓扑绝缘体的表面状态为特征，引起了表面杂质之间的整体铁磁RKKY相互作用。杂质和抢先的手性有序参数之间的附加耦合促进了系统表面处的表面时间反转对称性破坏解决方案。我们讨论相关方案，并通过适当选择具有高度各向异性交换耦合磁性吸附原子建议工程师面手性超导电性。