Flux-induced topological superconductivity in full-shell nanowires (Publication with Expression of Concern. See vol. 373, pg. 500, 2021)
Flux-induced topological superconductivity in full-shell nanowires (Publication with Expression of Concern. See vol. 373, pg. 500, 2021)
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DOI：
10.1126/science.aav3392
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发表时间：
2020-03-27
期刊：
影响因子：
56.9
通讯作者：
Marcus, C. M.
中科院分区：
文献类型：
--
作者：
Vaitiekenas, S.;Winkler, G. W.;Marcus, C. M.
混合半导体-超导纳米线已成为实现拓扑超导（TSC）的有前途的平台。在这里，我们提出了一种利用磁通量应用于半导体纳米线核心周围的完整超导壳的 TSC 路线。穿入磁芯揭示了接近零外加磁通的硬感应间隙（对应于零相绕组），以及在一个外加磁通量子周围具有离散零能量状态的间隙区域（对应于 2p 相绕组）。理论分析表明，超导相的缠绕可以引起向支持马约拉纳零模式的拓扑相的转变。测量的围绕一个通量量子的库仑阻塞峰间距显示出长度依赖性，这与纳米线末端存在马约拉纳模式一致。
Hybrid semiconductor-superconductor nanowires have emerged as a promising platform for realizing topological superconductivity (TSC). Here, we present a route to TSC using magnetic flux applied to a full superconducting shell surrounding a semiconducting nanowire core. Tunneling into the core reveals a hard induced gap near zero applied flux, corresponding to zero phase winding, and a gapped region with a discrete zero-energy state around one applied flux quantum, corresponding to 2p phase winding. Theoretical analysis indicates that the winding of the superconducting phase can induce a transition to a topological phase supporting Majorana zero modes. Measured Coulomb blockade peak spacing around one flux quantum shows a length dependence that is consistent with the existence of Majorana modes at the ends of the nanowire.