Experimental Observation of Acoustic Weyl Points and Topological Surface States
Abstract
Weyl points emerge as topological monopoles of Berry flux in the three-dimensional (3D) momentum space and have been extensively studied in topological semimetals. As the underlying topological principles apply to any type of waves under periodic boundary conditions, Weyl points can also be realized in classical wave systems, which are easier to engineer compared to condensed matter materials. Here, we made an acoustic Weyl phononic crystal by breaking space inversion (P) symmetry using a combination of slanted acoustic waveguides. We conducted angle-resolved transmission measurements to characterize the acoustic Weyl points. We also experimentally confirmed the existence of acoustic "Fermi arcs" and demonstrated robust one-way acoustic transport, where the surface waves can overcome a step barrier without reflection. This work lays a solid foundation for the basic research in 3D topological acoustic effects.
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Cite
@article{arxiv.1803.00828,
title = {Experimental Observation of Acoustic Weyl Points and Topological Surface States},
author = {Hao Ge and Xu Ni and Yuan Tian and Samit Kumar Gupta and Ming-Hui Lu and Xin Lin and Wei-Dong Huang and C. T. Chan and Yan-Feng Chen},
journal= {arXiv preprint arXiv:1803.00828},
year = {2018}
}
Comments
17 pages, 5 figures