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Josephson signatures of Weyl node creation and annihilation in irradiated Dirac semimetals

机译：Josephson在辐照的Dirac半球中创建和湮灭的Josephson签名

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摘要

Weyl node creation and annihilation are unique topological phenomena associated with Weyl fermions. Besides the magnetic field, high-frequency illumination can also break the time-reversal symmetry and induce the creation and annihilation of Weyl nodes from a Dirac semimetal. Experimentally, the Weyl node creation and annihilation induced by a magnetic field have been verified by the signature of negative magnetoresistance. In this work, instead of magnetoresistance signatures by application of a magnetic field, we theoretically study the Josephson signatures of Weyl node creation and annihilation in irradiated Dirac semimetals. It is found that Weyl node creation is accompanied by a two-mode oscillation and 0-pi transitions in the Josephson current. We further illustrate that two oscillation modes stem from two Andreev reflection processes: opposite-chirality and equal-chirality Andreev reflections, respectively. With Weyl node annihilation, the Josephson current is first shut down and then recovered by the activation of spin-flipping at interfaces by two ferromagnets. The recovered anomalous Josephson current has an arbitrary and tunable ground-state phase difference, other than 0 and pi. These predictions are helpful for experimental observation of illumination-induced Weyl node creation and annihilation.
机译：Weyl节点创建和湮灭是与威尔徒怪物相关的独特拓扑现象。除了磁场外，高频照明还可以破坏时间反转对称性，并诱导从DIRAC半型探测威尔节点的创建和湮灭。通过实验，通过磁场引起的威基节点创建和湮灭已经通过负磁阻的签名来验证。在这项工作中，通过应用磁场而不是磁阻签名，我们从理论上研究了威尔节点创建和湮灭的Josephson签名在辐照的Dirac半球中。发现Weyl节点创建伴随着Josephson Current中的两模振荡和0-PI转换。我们进一步说明了两种振荡模式，分别是两种AndreeV反射过程：相反的性行为和平均性肾脏反射。利用Weyl节点湮灭，首先将Josephson电流关闭，然后通过两个铁圆形仪在接口处的旋转翻转的激活来恢复。回收的异常约瑟夫森电流具有任意和可调地面的地面差异，除0和PI之外。这些预测有助于对照明诱导的Weyl节点创建和湮灭的实验观察。

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  • 来源
    《Physical review》 |2019年第11期|115414.1-115414.8|共8页
  • 作者

    Fu Pei-Hao; Wang Jun; Liu Jun-Feng; Wang Rui-Qiang;

  • 作者单位

    Guangzhou Univ Sch Phys & Elect Engn Guangzhou 510006 Guangdong Peoples R China|Southern Univ Sci & Technol Dept Phys Shenzhen 518055 Peoples R China|South China Normal Univ Sch Phys & Telecommun Engn Guangdong Prov Key Lab Quantum Engn & Quantum Mat Guangzhou 510006 Guangdong Peoples R China;

    Southeast Univ Dept Phys Nanjing 210096 Jiangsu Peoples R China;

    Guangzhou Univ Sch Phys & Elect Engn Guangzhou 510006 Guangdong Peoples R China|Southern Univ Sci & Technol Dept Phys Shenzhen 518055 Peoples R China;

    South China Normal Univ Sch Phys & Telecommun Engn Guangdong Prov Key Lab Quantum Engn & Quantum Mat Guangzhou 510006 Guangdong Peoples R China;

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