论文标题
底物自旋 - 轨耦合对石链的拓扑间隙尺寸的影响
Effect of substrate spin-orbit coupling on the topological gap size of Shiba chains
论文作者
论文摘要
在$ s $波超导的底物上实现磁杂质链中的主要结合状态取决于对单个磁杂质结合状态和自旋轨道耦合（SOC）的能量和杂交的微调。虽然最近的实验研究了前两个参数的影响，但SOC的效果在实验上仍然在很大程度上没有探索。在这里，我们介绍了沿TA（110）上[001]方向的封闭式MN链的扫描隧道光谱研究，该链条与先前研究的NB（110）系统相比，其原子和表面电子结构几乎相同，但SOC的三倍。主要的志娃带具有非常相似的分散体，但是相对于$ \ vardelta $，相对于NB情况，它相对于$ \ vardelta $的微型群增加了1.9倍，这可以归因于更强的SOC。
Realizing Majorana bound states in chains of magnetic impurities on $s$-wave superconducting substrates relies on a fine tuning of the energy and hybridization of the single magnetic impurity bound states and of the spin-orbit coupling (SOC). While recent experiments investigate the influence of the former two parameters, the effect of SOC remained experimentally largely unexplored. Here, we present a scanning tunneling spectroscopy study of close-packed Mn chains along the [001]-direction on Ta(110) which has almost identical atomic and surface electronic structure compared to the previously studied Nb(110) system, but a three times larger SOC. The dominant Shiba band has a very similar dispersion, but its minigap, taken relative to $\varDelta$, is increased by a factor of 1.9 with respect to the Nb case, which can be ascribed to the stronger SOC.
