论文标题
频段匹配在超导体和正常金属之间的接近效应中的作用
The role of band matching in the proximity effect between a superconductor and a normal metal
论文作者
论文摘要
我们将密度功能理论和扫描隧道显微镜结合在一起，以研究散装RU（0001）超导体和CO的原子较薄的覆盖层之间的接近性效应。我们已经确定CO单层可以在两个不同的堆栈中生长：HCP和Reftructed hcpteppsepepsilon和textepepsilon light型堆叠。我们通过实验和密度功能理论分析了它们的电子结构。尽管磁性HCP堆叠在与shiba状态的结合中显示出较弱的接近效应，并且几乎没有抑制底物的超导性，但更复杂的\ textepsilon样堆叠几乎完全是完全超导，并在岛上显示了边缘状态。我们将这种边缘状态识别为由\ textepsilon核心周围的本地HCP边缘引起的微不足道状态。我们通过界面的透明度低，解释了RU和磁性HCP岛之间的较弱接近性效应，而非磁性\ Textepsilon样堆叠的大型化学单位细胞可以在界面上提高界面的动量保护，从而使其透明并引起明显的接近效应。
We combine density functional theory and scanning tunneling microscopy to study the proximity effects between a bulk Ru(0001) superconductor and an atomically thin overlayer of Co. We have identified that the Co monolayer can grow in two different stackings: the hcp and a reconstructed \textepsilon-like stacking. We analyze their electronic structure from both experiments and density functional theory. While the magnetic hcp stacking shows a weak proximity effect in combination with Shiba states and with almost no suppression of superconductivity of the substrate, the more complex \textepsilon-like stacking becomes almost fully superconducting and displays an edge state at the island rim. We identify this edge state as a trivial state caused by a local hcp rim around the \textepsilon-core. We explain the weak proximity effect between Ru and the magnetic hcp islands by a low transparency of the interface, while the large chemical unit cell of the non-magnetic \textepsilon-like stacking lifts the momentum conservation at the interface making it transparent and causing a clear proximity effect.
