Department of Physics, South University of Science and Technology of China, Shenzhen 518055, China.
Department of Physics, Southeast University, Nanjing 210096, China.
Sci Rep. 2017 Mar 7;7:43899. doi: 10.1038/srep43899.
We propose the Josephson junctions linked by a normal metal between a d + id superconductor and another d + id superconductor, a d-wave superconductor, or a s-wave superconductor for identifying the chiral d + id superconductivity. The time-reversal breaking in the chiral d-wave superconducting state is shown to result in a Josephson φ-junction state where the current-phase relation is shifted by a phase φ from the sinusoidal relation, other than 0 and π. The ground-state phase difference φ and the critical current can be used to definitely confirm and read the information about the d + id superconductivity. A smooth evolution from conventional 0-π transitions to tunable φ-states can be observed by changing the relative magnitude of two types of d-wave components in the d + id pairing. On the other hand, the Josephson junction involving the d + id superconductor is also the simplest model to realize a φ- junction, which is useful in superconducting electronics and superconducting quantum computation.
我们提出了由一个正常金属连接的约瑟夫森结，该约瑟夫森结位于 d + id 超导体和另一个 d + id 超导体、d 波超导体或 s 波超导体之间，用于识别手性 d + id 超导性。结果表明，手性 d 波超导态中的时间反演破坏会导致约瑟夫森 φ 结态，其中电流-相位关系偏离正弦关系，而不是 0 和 π。通过改变 d + id 配对中两种类型的 d 波分量的相对大小，可以观察到从常规的 0-π 转变到可调的 φ 态的平滑演变。另一方面，涉及 d + id 超导体的约瑟夫森结也是实现 φ 结的最简单模型，它在手超导电子学和超导量子计算中很有用。
