Wakamura T, Wu N J, Chepelianskii A D, Guéron S, Och M, Ferrier M, Taniguchi T, Watanabe K, Mattevi C, Bouchiat H
Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405, Orsay, France.
Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France.
Phys Rev Lett. 2020 Dec 31;125(26):266801. doi: 10.1103/PhysRevLett.125.266801.
We demonstrate the enhanced robustness of the supercurrent through graphene-based Josephson junctions in which strong spin-orbit interactions (SOIs) are induced. We compare the persistence of a supercurrent at high out-of-plane magnetic fields between Josephson junctions with graphene on hexagonal boron-nitride and graphene on WS_{2}, where strong SOIs are induced via the proximity effect. We find that in the shortest junctions both systems display signatures of induced superconductivity, characterized by a suppressed differential resistance at a low current, in magnetic fields up to 1 T. In longer junctions, however, only graphene on WS_{2} exhibits induced superconductivity features in such high magnetic fields, and they even persist up to 7 T. We argue that these robust superconducting signatures arise from quasiballistic edge states stabilized by the strong SOIs induced in graphene by WS_{2}.
我们展示了通过基于石墨烯的约瑟夫森结实现的超电流增强的鲁棒性，其中诱导了强自旋轨道相互作用（SOI）。我们比较了在面外高磁场下，六方氮化硼上的石墨烯和WS₂上的石墨烯制成的约瑟夫森结之间超电流的持续性，其中通过近邻效应诱导了强SOI。我们发现，在最短的结中，两个系统在高达1 T的磁场中都表现出诱导超导的特征，其特征是在低电流下微分电阻受到抑制。然而，在较长的结中，只有WS₂上的石墨烯在如此高的磁场中表现出诱导超导的特征，并且这些特征甚至持续到7 T。我们认为，这些鲁棒的超导特征源于由WS₂在石墨烯中诱导的强SOI稳定的准弹道边缘态。
