论文标题
旋转轨道耦合诱导抗铁磁二聚体中Yu-Shiba-Rusinov状态的分裂
Spin-orbit coupling induced splitting of Yu-Shiba-Rusinov states in antiferromagnetic dimers
论文作者
论文摘要
与超导体的库珀对结合的磁原子诱导Yu-Shiba-Rusinov状态（在简短的shiba状态下）。在存在足够强的自旋轨道耦合的情况下，在这种原子的集合中，由shiba状态杂交形成的频带可以支持与Majorana绑定状态定位于合奏边缘的低维拓扑超导性。然而，自旋轨道耦合在磁原子二聚体（此类系统的构件）二聚体中杂交的作用在很大程度上没有探索。在这里，我们揭示了杂交多轨道北态的演变，从单个MN adatom到人为构造的铁磁性和抗磁性耦合的Mn二聚体，位于NB（110）表面上。在二聚体形成时，将两种类型的磁比对的原子北极轨道分开。我们的理论计算将抗磁二聚体中的意外裂片归因于表面的自旋轨道耦合和反转对称性损坏。我们的观察结果指出了以前未经考虑的因素与志着射频的形成及其拓扑分类的相关性。
Magnetic atoms coupled to the Cooper pairs of a superconductor induce Yu-Shiba-Rusinov states (in short Shiba states). In the presence of sufficiently strong spin-orbit coupling, the bands formed by hybridization of the Shiba states in ensembles of such atoms can support low-dimensional topological superconductivity with Majorana bound states localized on the ensembles' edges. Yet, the role of spin-orbit coupling for the hybridization of Shiba states in dimers of magnetic atoms, the building blocks for such systems, is largely unexplored. Here, we reveal the evolution of hybridized multi-orbital Shiba states from a single Mn adatom to artificially constructed ferromagnetically and antiferromagnetically coupled Mn dimers placed on a Nb(110) surface. Upon dimer formation, the atomic Shiba orbitals split for both types of magnetic alignment. Our theoretical calculations attribute the unexpected splitting in antiferromagnetic dimers to spin-orbit coupling and broken inversion symmetry at the surface. Our observations point out the relevance of previously unconsidered factors on the formation of Shiba bands and their topological classification.
