论文标题
通过拓扑接近效应将常规超导体转换为拓扑超导体
Conversion of a conventional superconductor into a topological superconductor by topological proximity effect
论文作者
论文摘要
托管Majorana Fermions的拓扑超导体（TSC）的实现是凝结物理学的核心挑战。一种方法是在异质结构中使用超导接近效应（SPE），在该方法中，拓扑绝缘子与超导体接触到通过cooper对穿过界面，托有有效的P波配对。但是，这种方法在访问埋在表面深处的拓扑界面方面遇到了困难。在这里，我们提出了一种替代方法，以实现没有SPE的拓扑超导性。在TLBISE2上生长的PB（111）薄膜中，我们发现底物TLBISE2的狄拉克锥状态迁移到PB膜的顶部表面，并在PB的超导过渡温度下获得了能量缺口。这表明BCS超导体通过拓扑接近效应将其转化为TSC。我们的发现开辟了一条操纵材料的拓扑超导特性的途径。
Realization of topological superconductors (TSCs) hosting Majorana fermions is a central challenge in condensed-matter physics. One approach is to use the superconducting proximity effect (SPE) in heterostructures, where a topological insulator contacted with a superconductor hosts an effective p-wave pairing by the penetration of Cooper pairs across the interface. However, this approach suffers a difficulty in accessing the topological interface buried deep beneath the surface. Here, we propose an alternative approach to realize topological superconductivity without SPE. In a Pb(111) thin film grown on TlBiSe2, we discover that the Dirac-cone state of substrate TlBiSe2 migrates to the top surface of Pb film and obtains an energy gap below the superconducting transition temperature of Pb. This suggests that a BCS superconductor is converted into a TSC by the topological proximity effect. Our discovery opens a route to manipulate topological superconducting properties of materials.
