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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Josephson current signatures of the Majorana flat bands on the surface of time-reversal-invariant Weyl and Dirac semimetals
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APS -APS March Meeting 2017 - Event - Josephson current signatures of the Majorana flat bands on the surface of time-reversal-invariant Weyl and Dirac semimetals

机译：APS -APS 2017年3月会议-活动-时变不变Weyl和Dirac半金属表面上的Majorana扁带签名

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摘要

A linear Josephson junction mediated by the surface states of a time-reversal-invariant Weyl or Dirac semimetal localizes Majorana flat bands protected by the time-reversal symmetry. We show that as a result, the Josephson current exhibits a discontinuous jump at $pi$ phase difference which can serve as an experimental signature of the Majorana bands. The magnitude of the jump scales proportionally to the junction length and the momentum space distance between the Weyl nodes projected onto the junction. It also exhibits a characteristic dependence on the junction orientation. We demonstrate that the jump is robust against the effects of non-zero temperature and weak non-magnetic disorder.
机译：时变不变的Weyl或Dirac半金属的表面状态介导的线性约瑟夫逊结位于受时变对称性保护的Majorana平坦带上。我们表明，结果是，约瑟夫森电流在$ pi $相位差处表现出不连续的跳跃，可以作为Majorana乐队的实验信号。跳跃的大小与连接点的长度和投射到连接点上的Weyl节点之间的动量空间距离成比例。它还表现出对结取向的特性依赖性。我们证明了这种跳跃对于非零温度和弱非磁性无序的影响是鲁棒的。

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