Spin-orbit coupling induced splitting of Yu-Shiba-Rusinov states in antiferromagnetic dimers.
Spin-orbit coupling induced splitting of Yu-Shiba-Rusinov states in antiferromagnetic dimers.
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DOI：
10.1038/s41467-021-22261-6
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发表时间：
2021-04-01
影响因子：
16.6
通讯作者：
Wiesendanger R
中科院分区：
文献类型：
--
作者：
Beck P;Schneider L;Rózsa L;Palotás K;Lászlóffy A;Szunyogh L;Wiebe J;Wiesendanger R
磁原子与超导体的库珀对耦合，产生Yu-Shiba-Rusinov态（简称Shiba态）。在存在足够强的自旋轨道耦合的情况下，由这些原子的系综中的Shiba态的杂化形成的带可以支持低维拓扑超导性，其中Majorana束缚态位于系综的边缘。然而，自旋-轨道耦合在磁原子二聚体（此类系统的构建模块）中Shiba态杂交中的作用在很大程度上尚未得到探索。在这里，我们揭示了从单个Mn吸附原子到人工构建的铁磁和反铁磁耦合Mn二聚体的杂化多轨道Shiba态的演化。在二聚体形成时，原子Shiba轨道分裂为两种类型的磁性排列。我们的理论计算归因于反铁磁二聚体的意外分裂自旋轨道耦合和破缺的反演对称性在表面。我们的观察指出了以前未考虑的因素的相关性的形成的芝带和它们的拓扑分类。自旋-轨道耦合对超导表面磁性原子二聚体中Shiba态杂化的影响还没有得到研究。在这里，作者揭示了原子Shiba轨道的分裂，由于自旋轨道耦合和反转对称性破缺反铁磁耦合Mn二聚体放置在Nb（110）表面。
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. The influence of spin-orbit coupling on the hybridization of Shiba states in dimers of magnetic atoms on superconducting surfaces remains unexplored. Here, the authors reveal a splitting of atomic Shiba orbitals due to spin-orbit coupling and broken inversion symmetry in antiferromagnetically coupled Mn dimers placed on a Nb(110) surface.
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