Zhang Enze, Sun Zi-Ting, Jia Zehao, Yang Jinshan, Yan Jingyi, Ai Linfeng, Xie Ying-Ming, Zhang Yuda, Gao Xue-Jian, Xu Xian, Liu Shanshan, Ma Qiang, Hu Chaowei, Kou Xufeng, Zou Jin, Ni Ni, Law Kam Tuen, Dong Shaoming, Xiu Faxian
State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
Shanghai Research Center for Quantum Sciences, Shanghai 201315, China.
Sci Adv. 2025 May 16;11(20):eads8730. doi: 10.1126/sciadv.ads8730. Epub 2025 May 14.
Hybridizing superconductivity with topology and magnetism attracts growing interest in condensed matter physics. Here, we present our findings on the measurement of supercurrent induced in an intrinsic antiferromagnetic topological insulator MnBiTe. By constructing a MnBiTe proximity Josephson junction, we observed an anomalously large period of the Fraunhofer patterns, indicating a strong Josephson coupling state. As the MnBiTe thickness is reduced, a distinct asymmetric edge supercurrent emerges, aligning consistently with the observed oscillatory junction magnetoresistance. Leveraging this large asymmetric edge supercurrent, we have realized a nonvolatile Josephson diode device with programmable polarity, achieved through training with an out-of-plane magnetic field. Theoretical calculations substantiate that these behaviors are attributed to the interference between the highly asymmetric topological edge channel-mediated supercurrent induced in MnBiTe. Our study establishes this system as a promising avenue for investigating topological superconductivity, chiral Majorana edge modes, and advanced functionality device applications.
将超导性与拓扑学和磁性相结合，在凝聚态物理领域引起了越来越多的关注。在此，我们展示了关于本征反铁磁拓扑绝缘体MnBiTe中感应超电流测量的研究结果。通过构建MnBiTe近邻约瑟夫森结，我们观察到弗劳恩霍夫图案出现异常大的周期，这表明存在强约瑟夫森耦合状态。随着MnBiTe厚度的减小，出现了明显的非对称边缘超电流，这与观察到的振荡结磁电阻一致。利用这种大的非对称边缘超电流，我们通过在面外磁场中进行训练，实现了一种具有可编程极性的非易失性约瑟夫森二极管器件。理论计算证实，这些行为归因于MnBiTe中由高度非对称拓扑边缘通道介导的超电流之间的干涉。我们的研究将该系统确立为研究拓扑超导性、手性马约拉纳边缘模式和先进功能器件应用的一条有前景的途径。
