论文标题
各向异性非线性光学响应的节点环材料
Anisotropic non-linear optical response of nodal loop materials
论文作者
论文摘要
淋巴结线的半法线最近引起了许多实验和理论上的兴趣，其差距沿着3D布里渊区的非常规轨迹的差距截止。这些轨迹或淋巴结线可以结合成循环，并与复杂的拓扑结合复杂的打结或链接的配置。在这项工作中，我们研究了两个链接，未链接和接触式配置中两个节点循环的半古典光学响应，尤其关注响应各向异性和非线性的相互作用。我们提供了统一这些方面的几何图片，并阐明了节点拓扑和几何形状的影响。基于从通用多节点环场中抽象的模型，无论是有或没有链接，我们的发现都适用于具有多个节点或循环的大型节点半学材料。
Nodal line semimetals have lately aroused much experimental and theoretical interest, with their gap closing along unconventional trajectories in the 3D Brillouin zone. These trajectories or nodal lines can close into loops and trace out intricate knotted or linked configurations with complicated topologies. In this work, we investigate the semi-classical optical response of two nodal loops in linked, unlinked and touching configurations, focusing particularly on the interplay of response anisotropy and non-linearity. We provide a geometric picture that unifies these aspects and sheds light on the effects of nodal topology and geometry. Based on a model abstracted from generic multi nodal loop scenarios, both with or without linkages, our findings will be applicable for a large class of nodal semimetal materials with multiple nodal lines or loops.
