Department of Chemistry, KAIST , Daejeon 34141, Korea.
Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST) , Gwangju 61005, Korea.
Nano Lett. 2017 Nov 8;17(11):6997-7002. doi: 10.1021/acs.nanolett.7b03571. Epub 2017 Oct 27.
We report on the fabrication and electrical transport properties of superconducting junctions made of β-AgSe topological insulator (TI) nanowires in contact with Al superconducting electrodes. The temperature dependence of the critical current indicates that the superconducting junction belongs to a short and diffusive junction regime. As a characteristic feature of the narrow junction, the critical current decreases monotonously with increasing magnetic field. The stochastic distribution of the switching current exhibits the macroscopic quantum tunneling behavior, which is robust up to T = 0.8 K. Our observations indicate that the TI nanowire-based Josephson junctions can be a promising building block for the development of nanohybrid superconducting quantum bits.
我们报告了由β-AgSe 拓扑绝缘体 (TI) 纳米线与 Al 超导电极接触制成的超导结的制造和电输运性质。临界电流的温度依赖性表明，超导结属于短而扩散的结态。作为窄结的特征，临界电流随磁场的增加单调减小。开关电流的随机分布表现出宏观量子隧道行为，在 T = 0.8 K 时仍然稳健。我们的观察表明，基于 TI 纳米线的约瑟夫森结可以成为开发纳米混合超导量子位的有前途的构建块。
