Supercurrent and Multiple Andreev Reflections in an InSb Nanowire Josephson Junction
Supercurrent and Multiple Andreev Reflections in an InSb Nanowire Josephson Junction
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DOI：
10.1021/nl203380w
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发表时间：
2012-01-01
期刊：
影响因子：
10.8
通讯作者：
Xu, H. Q.
中科院分区：
文献类型：
--
作者：
Nilsson, H. A.;Samuelsson, P.;Xu, H. Q.
外延生长的高质量半导体 InSb 纳米线是新兴材料系统，用于开发高性能纳米电子学、量子信息处理和通信设备以及研究固态系统中的新物理现象。在这里，我们报告了由具有铝基超导触点的 InSb 纳米线制成的超导体-普通导体-超导体结器件的测量结果。测量结果显示，接近感应超电流流过 InSb 纳米线段，其临界电流可通过电流偏置配置中的栅极进行调节，以及电压偏置配置中的多个 Andreev 反射特性。还研究了临界电流的温度依赖性和磁场依赖性以及结的多次安德烈夫反射特性。此外，我们从测量中提取过量电流并研究其温度和磁场依赖性。基于InSb纳米线的约瑟夫森结装置中超导性的成功观测表明，InSb纳米线为创造和观察固态系统中的马约拉纳费米子等新颖的物理现象提供了优异的材料系统。
Epitaxially grown, high quality semiconductor InSb nanowires are emerging material systems for the development of high performance nanoelectronics and quantum information processing and communication devices and for the studies of new physical phenomena in solid state systems. Here, we report on measurements of a superconductor-normal conductor-superconductor junction device fabricated from an InSb nanowire with aluminum-based superconducting contacts. The measurements show a proximity-induced supercurrent flowing through the InSb nanowire segment with a critical current tunable by a gate in the current bias configuration and multiple Andreev reflection characteristics in the voltage bias configuration. The temperature dependence and the magnetic field dependence of the critical current and the multiple Andreev reflection characteristics of the junction are also studied. Furthermore, we extract the excess current from the measurements and study its temperature and magnetic field dependences. The successful observation of the superconductivity in the InSb nanowire-based Josephson junction device indicates that InSb nanowires provide an excellent material system for creating and observing novel physical phenomena such as Majorana fermions in solid-state systems.