Randle Michael D, Hosoda Masayuki, Deacon Russell S, Ohtomo Manabu, Zellekens Patrick, Watanabe Kenji, Taniguchi Takashi, Okazaki Shota, Sasagawa Takao, Kawaguchi Kenichi, Sato Shintaro, Ishibashi Koji
Advanced Device Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
Fujitsu Research, Fujitsu Ltd., 10-1 Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0197, Japan.
Adv Mater. 2023 Sep;35(35):e2301683. doi: 10.1002/adma.202301683. Epub 2023 Jul 24.
Systems combining superconductors with topological insulators offer a platform for the study of Majorana bound states and a possible route to realize fault tolerant topological quantum computation. Among the systems being considered in this field, monolayers of tungsten ditelluride (WTe ) have a rare combination of properties. Notably, it has been demonstrated to be a quantum spin Hall insulator (QSHI) and can easily be gated into a superconducting state. Measurements on gate-defined Josephson weak-link devices fabricated using monolayer WTe are reported. It is found that consideration of the 2D superconducting leads are critical in the interpretation of magnetic interference in the resulting junctions. The reported fabrication procedures suggest a facile way to produce further devices from this technically challenging material and the results mark the first step toward realizing versatile all-in-one topological Josephson weak-links using monolayer WTe .
将超导体与拓扑绝缘体相结合的系统为研究马约拉纳束缚态提供了一个平台，也是实现容错拓扑量子计算的一条可能途径。在该领域所考虑的系统中，二碲化钨（WTe₂）单层具有罕见的特性组合。值得注意的是，它已被证明是一种量子自旋霍尔绝缘体（QSHI），并且可以很容易地通过门电压调控进入超导态。本文报道了对使用WTe₂单层制备的门定义约瑟夫森弱连接器件的测量结果。研究发现，在解释所得结中的磁干扰时，考虑二维超导引线至关重要。所报道的制造工艺为从这种技术上具有挑战性的材料制备更多器件提供了一种简便方法，这些结果标志着朝着使用WTe₂单层实现通用一体化拓扑约瑟夫森弱连接迈出了第一步。
