Supercurrent in the quantum Hall regime
Supercurrent in the quantum Hall regime
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DOI：
10.1126/science.aad6203
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发表时间：
2016-05-20
期刊：
影响因子：
56.9
通讯作者：
Finkelstein, G.
中科院分区：
文献类型：
--
作者：
Amet, F.;Ke, C. T.;Finkelstein, G.
联合收割机将超导性和量子霍尔（QH）效应结合起来，是一条很有前途的创造拓扑态和激发态的途径。尽管有这种潜力，但QH体系中的超导性特征仍然很少，并且通过QH弱连接的超导电流一直难以观察。我们证明了在高达2特斯拉的磁场中，超导电极接触的封装石墨烯样品中存在一种独特的超导机制。在QH机制中观察到的超电流标志着在寻求奇异拓扑激发（如马约拉纳费米子和副费米子）方面迈出了重要的一步，这可能会在容错量子计算中找到应用。
A promising route for creating topological states and excitations is to combine superconductivity and the quantum Hall (QH) effect. Despite this potential, signatures of superconductivity in the QH regime remain scarce, and a superconducting current through a QH weak link has been challenging to observe. We demonstrate the existence of a distinct supercurrent mechanism in encapsulated graphene samples contacted by superconducting electrodes, in magnetic fields as high as 2 tesla. The observation of a supercurrent in the QH regime marks an important step in the quest for exotic topological excitations, such as Majorana fermions and parafermions, which may find applications in fault-tolerant quantum computing.