Nontrivial Chern Numbers in Three-Terminal Josephson Junctions
Nontrivial Chern Numbers in Three-Terminal Josephson Junctions
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DOI：
10.1103/physrevlett.119.136807
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发表时间：
2017-09-28
影响因子：
8.6
通讯作者：
Houzet, Manuel
中科院分区：
文献类型：
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作者：
Meyer, Julia S.;Houzet, Manuel
最近，有人预言四端约瑟夫森结的Andreev束缚态谱可能具有零能Weyl奇异性。使用一个超导相作为控制参数，这些奇异性与不同陈数的时间反演对称性破缺相之间的拓扑转变。在这里，我们表明，这样的拓扑转换也可以通过在一个三端几何结区的磁通量进行调谐。
Recently, it has been predicted that the Andreev bound state spectrum of four-terminal Josephson junctions may possess zero-energy Weyl singularities. Using one superconducting phase as a control parameter, these singularities are associated with topological transitions between time-reversal symmetry broken phases with different Chern numbers. Here we show that such topological transitions may also be tuned with a magnetic flux through the junction area in a three-terminal geometry.