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Experimental realization of a Weyl exceptional ring

机译：实验性实现威斯卓越戒指

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摘要

Weyl points are isolated degeneracies in reciprocal space that are monopoles of the Berry curvature. This topological charge makes them inherently robust to Hermitian perturbations of the system. However, non-Hermitian effects, usually inaccessible in condensed-matter systems, are an important feature of photonic systems, and when added to an otherwise Hermitian Weyl material have been predicted to spread the Berry charge of the Weyl point out onto a ring of exceptional points, creating a Weyl exceptional ring and fundamentally altering its properties. Here, we observe the implications of the Weyl exceptional ring using real-space measurements of an evanescently coupled bipartite optical waveguide array by probing its effects on the Fermi arc surface states and bulk diffraction properties of the two constituent sublattices in an experimental realization of a distributed Berry charge in a topological material.
机译：Weyl Points在互惠曲率垄断的互惠空间中被隔离退化。 这种拓扑充电使它们成为对系统的隐士扰动具有本质上的鲁棒。 然而，在冷凝物系统中通常无法访问的非密封效果是光子系统的重要特征，并且当添加到迄今为止呼密义的韦尔材料中时，预计将蔓延到韦尔的浆果指向一个卓越的环 点，创建威斯卓越的环，从根本上改变其性质。 在这里，我们使用在分布的实验性实现中探测其对两个组成子图示的Fermi弧表面状态和散装耦合的基础态和块状衍射性能的实际空间测量来观察Weyl Sexicional Ring的影响。 浆果充电拓扑材料。

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  • 来源
    《Nature photonics》 |2019年第9期|共7页
  • 作者

    Cerjan Alexander; Huang Sheng; Wang Mohan; Chen Kevin P.; Chong Yidong; Rechtsman Mikael C.;

  • 作者单位

    Penn State Univ Dept Phys 104 Davey Lab University Pk PA 16802 USA;

    Univ Pittsburgh Dept Elect &

    Comp Engn Pittsburgh PA USA;

    Univ Pittsburgh Dept Elect &

    Comp Engn Pittsburgh PA USA;

    Nanyang Technol Univ Sch Phys &

    Math Sci Singapore Singapore;

    Nanyang Technol Univ Sch Phys &

    Math Sci Singapore Singapore;

    Penn State Univ Dept Phys 104 Davey Lab University Pk PA 16802 USA;

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  • 正文语种 eng
  • 中图分类 光学;
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