Orbital tunable 0?π transitions in Josephson junctions with noncentrosymmetric topological superconductors
Orbital tunable 0?π transitions in Josephson junctions with noncentrosymmetric topological superconductors
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非中心对称拓扑超导体约瑟夫森结中轨道可调 0?π 跃迁
DOI：
10.1103/physrevb.102.144512
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发表时间：
2020
影响因子：
3.7
通讯作者：
Cuoco Mario
中科院分区：
文献类型：
--
作者：
Fukaya Yuri;Yada Keiji;Tanaka Yukio;Gentile Paola;Cuoco Mario
研究了由常规波超导体和多轨道非中心对称超导体耦合而成的约瑟夫森结中的约瑟夫森输运性质，其中多轨道非中心对称超导体具有轨道驱动的反转不对称性和各向同性轨道间自旋三重态配对.相反，规范的单带非中心对称超导体，我们证明了本地轨道间自旋三重态配对是绑在不同的波段与波对称性的符号变化的自旋单重态对振幅的发生。这种多带波态是一种独特的超导配置，它驱动着意想不到的约瑟夫森效应，其中0跃迁显示出高度的电子控制。值得注意的是，我们发现，一个非中心对称/波约瑟夫森结的相位状态可以切换0和之间的多种方式通过变化的电子填充，自旋轨道耦合的强度，反转不对称相互作用的幅度，和结的透明度。这些结果强调了约瑟夫森响应的固有轨道和电可调性，并提供了独特的途径来揭示非常规多轨道超导性的本质，并激发约瑟夫森量子器件的创新设计。
We investigate the Josephson transport properties in a Josephson junction consisting of a conventional-wave superconductor coupled to a multiorbital 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-wave symmetry. Such multiband-wave state is a unique superconducting configuration that drives unexpected Josephson effects with 0-transitions displaying a high degree of electronic control. Remarkably, we find that the phase state of a noncentrosymmetric/-wave Josephson junction can be toggled between 0 andin 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.