Rashba-自旋-轨道耦合对超导掺硼纳米金刚石薄膜的影响：界面三重态超导电性的证据
Effects of Rashba-spin-orbit coupling on superconducting boron-doped nanocrystalline diamond films: evidence of interfacial triplet superconductivity
摘要：
在金刚石的许多显著特性中，当重掺杂硼时的超导能力吸引了碳社区的极大兴趣。当考虑纳米晶硼掺杂系统时，减少的维度和限制效应导致了几个有趣的观察结果，最值得注意的是，混合超导相的特征。在这里，我们提出了超高分辨率透射电子显微镜成像的晶界，并演示了如何复杂的微观结构导致增强的载流子相关性。我们观察到自旋轨道耦合（SOC）的标志性特征表现为弱的反局域化效应。增强的SOC被认为是由于在晶界界面处的反转对称性破缺以及晶粒之间的反对称限制电位的组合，诱导Rashba型SOC。从一个明显的零偏置峰的差分电导，我们证明了一个三重态组件的签名，相信是由于自旋混合所造成的隧穿单线态库珀对通过这样的Rashba-SOC晶界结。
英文摘要：
Among the many remarkable properties of diamond, the ability to superconduct when heavily doped with boron has attracted much interest in the carbon community. When considering the nanocrystalline boron doped system, the reduced dimensionality and confinement effects have led to several intriguing observations most notably, signatures of a mixed superconducting phase. Here we present ultra-high-resolution transmission electron microscopy imaging of the grain boundary and demonstrate how the complex microstructure leads to enhanced carrier correlations. We observe hallmark features of spin-orbit coupling (SOC) manifested as the weak anti-localization effect. The enhanced SOC is believed to result from a combination of inversion symmetry breaking at the grain boundary interfaces along with antisymmetric confinement potential between grains, inducing a Rashba-type SOC. From a pronounced zero bias peak in the differential conductance, we demonstrate signatures of a triplet component believed to result from spin mixing caused by tunneling of singlet Cooper pairs through such Rashba-SOC grain boundary junctions.
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