Mandal Pankaj, Taufertshöfer Nicolai, Lunczer Lukas, Stehno Martin P, Gould Charles, Molenkamp Laurens W
Faculty for Physics and Astronomy (EP3), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
Institute for Topological Insulators, Am Hubland, D-97074 Würzburg, Germany.
Nano Lett. 2022 May 11;22(9):3557-3561. doi: 10.1021/acs.nanolett.1c04903. Epub 2022 Apr 26.
Hybrid samples combining superconductors with magnetic topological insulators are a promising platform for exploring exotic new transport physics. We examine a Josephson junction of such a system based on the dilute magnetic topological insulator (Hg,Mn)Te and the type II superconductor MoRe. In the zero and very low field limits, to the best of our knowledge, the device shows, for the first time, an induced supercurrent through a magnetically doped semiconductor, in this case, a topological insulator. At higher fields, a rich and hysteretic magnetoresistance is revealed. Careful analysis shows that the explanation of this behavior can be found in magnetic flux focusing stemming from the Meissner effect in the superconductor, without invoking any role of proximity-induced superconductivity. The phenomena is important because it will ubiquitously coexist with any exotic new physics that may be present in this class of devices.
将超导体与磁性拓扑绝缘体相结合的混合样品是探索奇异新输运物理的一个有前景的平台。我们研究了基于稀磁拓扑绝缘体（Hg，Mn）Te和II型超导体MoRe的此类系统的约瑟夫森结。在零场和极低场极限下，据我们所知，该器件首次在磁性掺杂半导体（在这种情况下为拓扑绝缘体）中显示出感应超电流。在更高场强下，揭示出丰富且具有滞后现象的磁阻。仔细分析表明，这种行为的解释可以在超导体中迈斯纳效应引起的磁通量聚焦中找到，而无需考虑近邻诱导超导的任何作用。该现象很重要，因为它将与这类器件中可能存在的任何奇异新物理普遍共存。
