Ideal type-II Weyl points in topological circuits
Abstract
Weyl points (WPs), as nodal degenerate points in three-dimensional (3D) momentum space, are ideal if they are symmetry-related, well-separated, residing at the same energy and far from the nontopological bands. Although type-II WPs show some unique features compared with type-I counterparts, ideal type-II WPs have not yet been reported due to the lack of an ideal Weyl system with enough flexibility to tilt the dispersion bands. By stacking two-dimensional (2D) layers of inductor-capacitor (LC) resonator dimers with the breaking of parity inversion symmetry, here we experimentally realize the topological circuits with only the topological bands and observe a minimal number of four ideal type-II WPs. Two hallmark features of type-II WPs: a strongly tilted band structure with two group velocities having the same sign near type-II WPs and the topological surface states in an incomplete bandgap have been demonstrated. Our results establish an ideal system to the further study of Weyl physics and provide a new perspective to the access of topological matters.
Cite
@article{arxiv.1910.03503,
title = {Ideal type-II Weyl points in topological circuits},
author = {Rujiang Li and Bo Lv and Huibin Tao and Jinhui Shi and Yidong Chong and Baile Zhang and Hongsheng Chen},
journal= {arXiv preprint arXiv:1910.03503},
year = {2020}
}