论文标题
约瑟夫森电流通过孤立的Majorana零模式
Josephson current via an isolated Majorana zero mode
论文作者
论文摘要
我们研究了$ S $波和拓扑超导体之间的连接处的平衡DC Josephson电流。库珀（Cooper）从$ S $ - 波超导铅从交界处的未配对Majorana零模式转移到拓扑侧，或者通过上述差距连续体状态转移到拓扑侧。我们发现，当传统导线中的时间反转对称性被损坏时，可以通过诱导Zeeman拆分的外部施加磁场打破时，对超电流的贡献可以打开。此外，如果磁场在有效自旋轨道场的方向上具有一个成分，则将在零相差下有一个主要的诱导的异常超流。这种行为可以作为Majorana零模式的签名特征，并且仅具有超导触点的设备可访问。
We study the equilibrium dc Josephson current in a junction between an $s$-wave and a topological superconductor. Cooper pairs from the $s$-wave superconducting lead can transfer to the topological side either via an unpaired Majorana zero mode localized near the junction, or via the above-gap continuum states. We find that the Majorana contribution to the supercurrent can be switched on when time-reversal symmetry in the conventional lead is broken, e.g., by an externally applied magnetic field inducing a Zeeman splitting. Moreover, if the magnetic field has a component in the direction of the effective spin-orbit field, there will be a Majorana-induced anomalous supercurrent at zero phase difference. This behavior may serve as a signature characteristic of Majorana zero modes, and is accessible to devices with only superconducting contacts.
