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Title: Ideal type-II Weyl points in topological circuits
Authors: Li, Rujiang
Lv, Bo
Tao, Huibin
Shi, Jinhui
Chong, Yidong
Zhang, Baile
Chen, Hongsheng
Keywords: Science::Physics
Issue Date: 2021
Source: Li, R., Lv, B., Tao, H., Shi, J., Chong, Y., Zhang, B. & Chen, H. (2021). Ideal type-II Weyl points in topological circuits. National Science Review, 8(7), nwaa192-.
Project: MOE2015-T2-1-070
Tier 1 RG174/ 16 (S)
Journal: National Science Review
Abstract: Weyl points (WPs), nodal degenerate points in three-dimensional (3D) momentum space, are said to be 'ideal' if they are symmetry-related and well-separated, and reside at the same energy and far from nontopological bands. Although type-II WPs have unique spectral characteristics compared with type-I counterparts, ideal type-II WPs have not yet been reported because of a lack of an experimental platform with enough flexibility to produce strongly tilted dispersion bands. Here, we experimentally realize a topological circuit that hosts only topological bands with a minimal number of four ideal type-II WPs. By stacking two-dimensional (2D) layers of inductor-capacitor (LC) resonator dimers with the broken parity inversion symmetry (P), we achieve a strongly tilted band structure with two group velocities in the same direction, and topological surface states in an incomplete bandgap. Our results establish an ideal system for the further study of Weyl physics and other exotic topological phenomena.
ISSN: 2095-5138
DOI: 10.1093/nsr/nwaa192
DOI (Related Dataset): 10.21979/N9/SQHAEU
Schools: School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2020 The Author(s). Published by Oxford University Press on behalf of China Science Publishing & Media Ltd.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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