Probing Rotated Weyl Physics on Nonlinear Lithium Niobate-on-Insulator Chips
Probing Rotated Weyl Physics on Nonlinear Lithium Niobate-on-Insulator Chips
复制标题
探测非线性铌酸锂绝缘体芯片上的旋转外尔物理
DOI：
10.1103/physrevlett.127.013901
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发表时间：
2021
影响因子：
8.6
通讯作者：
Liu Hui
中科院分区：
文献类型：
--
作者：
Yan Zhi-Wei;Wang Qiang;Xiao Meng;Zhao Yu-Le;Zhu Shi-Ning;Liu Hui
拓扑光子学具有稳定的、能抵抗微扰的拓扑边缘状态，已被用于设计健壮的集成器件。在这里，我们提出了一项在三维参数空间中探索有趣的拓扑旋转Weyl物理的研究，该研究基于绝缘体上的铌酸锂(LNOI)芯片上的四元波导阵列。与以往研究单个Weyl结构的费米弧面面态不同，我们可以在合成参数空间中自由旋转的两个Weyl结构之间建立任意界面。由于晶格失配，这一有趣的系统很难在通常的三维Weyl半金属中实现。我们发现，界面是否具有无间隙的拓扑界面态取决于两种Weyl结构的相对旋转方向。在实验中，我们通过线性光传输和非线性二次谐波的产生，探索了TISS的局域特性。我们的研究介绍了一条在LNOI芯片上探索拓扑光子学的新途径，以及在集成非线性和量子光学中的各种应用。
Topological photonics, featured by stable topological edge states resistant to perturbations, has been utilized to design robust integrated devices. Here, we present a study exploring the intriguing topological rotated Weyl physics in a 3D parameter space based on quaternary waveguide arrays on lithium niobate-on-insulator (LNOI) chips. Unlike previous works that focus on the Fermi arc surface states of a single Weyl structure, we can experimentally construct arbitrary interfaces between two Weyl structures whose orientations can be freely rotated in the synthetic parameter space. This intriguing system was difficult to realize in usual 3D Weyl semimetals due to lattice mismatch. We found whether the interface can host gapless topological interface states or not is determined by the relative rotational directions of the two Weyl structures. In the experiment, we have probed the local characteristics of the TISs through linear optical transmission and nonlinear second harmonic generation. Our study introduces a novel path to explore topological photonics on LNOI chips and various applications in integrated nonlinear and quantum optics.