论文标题
在基于铁的超导体中，观察磁性adatom诱导的Majoraana涡流及其与现场诱导的Majoragan涡流的杂交
Observation of magnetic adatom-induced Majorana vortex and its hybridization with field-induced Majorana vortex in an iron-based superconductor
论文作者
论文摘要
编织少数零模式对于容忍缺陷的拓扑量子计算至关重要。具有非平凡带拓扑的铁基超导体最近成为一个令人惊讶的有希望的平台，用于在单个材料和相对较高的温度下在磁性涡流中创建不同的Majorana零模式。磁场诱导的Abrikosov涡旋晶格使得难以编织一组Majorana零模式，或者由于波动函数重叠而导致Majoraana Doublet的耦合。在这里，我们报告了用整数量化涡流状态和由沉积在表面上的磁Fe adatom引起的Majorana零模式的拟议量子异常涡流的观察。我们观察到其在基于铁的超导体FETE0.55SE0.45中附近田间诱导的主要涡旋的杂交。我们还观察到无涡流的Yu-shiba-Rusinov在Fe Atatoms处结合的状态，与基板的耦合较弱，并通过操纵交换耦合强度来发现Yu-Shiba-Rusinov态与Majora Zero Mode之间的可逆过渡。 Majorana零模式的双重起源，来自磁性正常和外部磁场，提供了一个新的单物质平台，用于研究其相互作用和在带有拓扑带结构的超导体中的相互作用和编织器。
Braiding Majorana zero modes is essential for fault-tolerant topological quantum computing. Iron-based superconductors with nontrivial band topology have recently emerged as a surprisingly promising platform for creating distinct Majorana zero modes in magnetic vortices in a single material and at relatively high temperatures. The magnetic field-induced Abrikosov vortex lattice makes it difficult to braid a set of Majorana zero modes or to study the coupling of a Majorana doublet due to overlapping wave functions. Here we report the observation of the proposed quantum anomalous vortex with integer quantized vortex core states and the Majorana zero mode induced by magnetic Fe adatoms deposited on the surface. We observe its hybridization with a nearby field-induced Majorana vortex in iron-based superconductor FeTe0.55Se0.45. We also observe vortex-free Yu-Shiba-Rusinov bound states at the Fe adatoms with a weaker coupling to the substrate, and discover a reversible transition between Yu-Shiba-Rusinov states and Majorana zero mode by manipulating the exchange coupling strength. The dual origin of the Majorana zero modes, from magnetic adatoms and external magnetic field, provides a new single-material platform for studying their interactions and braiding in superconductors bearing topological band structures.
