论文标题
高阶Weyl半法
Higher-Order Weyl Semimetals
论文作者
论文摘要
高阶拓扑会产生有趣的多维拓扑现象，而Weyl半学具有非常规的特性，例如手性异常。但是，到目前为止，Weyl物理学仍然与高阶拓扑结合了连接。在这里，我们报告了高阶Weyl点的理论发现，从而建立了如此重要的联系。我们证明，高阶Weyl点可以在手性材料（例如手性四方晶体）中出现，作为传统的Weyl Semimetal和3D高阶拓扑相之间的中间相。高阶Weyl半法子通过表现出并发性手性Fermi-Arc表面状态，拓扑铰链状态和动量依赖性分数铰链电荷来独特地表现出来，从而揭示了一类新型的高阶拓扑相。
Higher-order topology yields intriguing multidimensional topological phenomena, while Weyl semimetals have unconventional properties such as chiral anomaly. However, so far, Weyl physics remain disconnected with higher-order topology. Here, we report the theoretical discovery of higher-order Weyl points and thereby the establishment of such an important connection. We demonstrate that higher-order Weyl points can emerge in chiral materials such as chiral tetragonal crystals as the intermediate phase between the conventional Weyl semimetal and 3D higher-order topological phases. Higher-order Weyl semimetals manifest themselves uniquely by exhibiting concurrent chiral Fermi-arc surface states, topological hinge states, and the momentum-dependent fractional hinge charge, revealing a novel class of higher-order topological phases.
