Topological Shiba bands in artificial spin chains on superconductors
Topological Shiba bands in artificial spin chains on superconductors
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DOI：
10.1038/s41567-021-01234-y
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发表时间：
2021-05-13
期刊：
影响因子：
19.6
通讯作者：
Wiebe, Jens
中科院分区：
文献类型：
--
作者：
Schneider, Lucas;Beck, Philip;Wiebe, Jens
发展拓扑超导体以实现拓扑量子计算的一个主要挑战是它们的表征和控制。提出了在具有自旋-轨道耦合的S波超导体上组装磁性原子链，以单原子精度制备p波隙拓扑超导体。本文分析了Mn链中的Bogoliubov准粒子干涉，在Nb(110)面上一个原子一个原子地构造，并用动量分辨测量揭示了多轨道Shiba带的形成。我们发现，根据其形状和粒子-空穴的不对称强度，我们发现了一个带具有拓扑上非平凡的p波隙的证据。我们的工作是朝着仅用体电子能带结构性质确定多轨道系统拓扑相的独特实验方向迈出了重要的一步。超导体表面的磁性原子链在拓扑上具有非平凡的能带，可以容纳Majorana束缚态。
A major challenge in developing topological superconductors for implementing topological quantum computing is their characterization and control. It has been proposed that a p-wave-gapped topological superconductor can be fabricated with single-atom precision by assembling chains of magnetic atoms on s-wave superconductors with spin-orbit coupling. Here we analyse Bogoliubov quasiparticle interference in Mn chains, constructed atom by atom on Nb(110), and reveal the formation of multi-orbital Shiba bands using momentum-resolved measurements. We find evidence that one band features a topologically non-trivial p-wave gap, as inferred from its shape and particle-hole asymmetric intensity. Our work is an important step towards a distinct experimental determination of topological phases in multi-orbital systems by bulk electron band structure properties only.Chains of magnetic atoms on the surface of a superconductor are shown to have topologically non-trivial bands that could host Majorana bound states.