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Title: Probing rotated weyl physics on nonlinear lithium niobate-on-insulator chips
Authors: Yan, Zhi-Wei
Wang, Qiang
Xiao, Meng
Zhao, Yu-Le
Zhu, Shi-Ning
Liu, Hui
Keywords: Science::Physics
Issue Date: 2021
Source: Yan, Z., Wang, Q., Xiao, M., Zhao, Y., Zhu, S. & Liu, H. (2021). Probing rotated weyl physics on nonlinear lithium niobate-on-insulator chips. Physical Review Letters, 127(1), 013901-.
Journal: Physical Review Letters
Abstract: 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.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.127.013901
Rights: © 2021 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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