论文标题
轨道可调性0- $π$在约瑟夫森连接中与非中心拓扑超导体过渡
Orbital tunable 0-$π$ transitions in Josephson junctions with noncentrosymmetric topological superconductors
论文作者
论文摘要
我们研究了约瑟夫森的运输特性，该交通特性由传统的$ s $ - 波浪超导体组成，耦合到多轨非中心非中心超导超导体，该超导体由牙齿偏置驱动的反转差异和同型异位型内骨间旋转型三元素配对。与规范的单个带非中心对称超导体相反，我们证明了局部型内旋转 - 三个三重配对与在不同频段上以$ d $ - 波 - 波对称对称性的不同频段上的签名旋转旋转幅度的发生。这种多波段$ d^{\ pm} $ - 波状状态是一种独特的超导配置，可以通过0- $π$转换驱动意外的约瑟夫森效果，显示出高度的电子控制。值得注意的是，我们发现，通过电子填充的变化，自旋轨道耦合的强度，反转不对称相互作用的振幅和交界透明度，可以通过多种方式将非中心对称/$ s $ - $ s $ - 波的josephson结的相位状态以多种方式切换在0到$π$之间。这些结果突出了约瑟夫森响应的内在轨道和电气可调节性，并提供了独特的途径，以揭示非常规多用量超导性的性质，并激发了约瑟夫森量子设备的直觉设计。
We investigate the Josephson transport properties in a Josephson junction consisting of a conventional $s$-wave superconductor coupled to a multi-orbital noncentrosymmetric superconductor marked by an orbitally driven inversion asymmetry and isotropic interorbital spin-triplet pairing. Contrary to the canonical single band noncentrosymmetric superconductor, we demonstrate that the local interorbital spin-triplet pairing is tied to the occurrence of sign-changing spin-singlet pair amplitude on different bands with $d$-wave symmetry. Such multi-band $d^{\pm}$-wave state is a unique superconducting configuration that drives unexpected Josephson effects with 0-$π$ transitions displaying a high degree of electronic control. Remarkably, we find that the phase state of a noncentrosymmetric/$s$-wave Josephson junction can be toggled between 0 and $π$ in multiple ways through a variation of electron filling, strength of the spin-orbital coupling, amplitude of the inversion asymmetry interaction, and junction transparency. These results highlight an intrinsic orbital and electrical tunability of the Josephson response and provide unique paths to unveil the nature of unconventional multiorbital superconductivity as well as inspire innovative designs of Josephson quantum devices.
