Acoustic seminar | 17 October 2025

The report focuses on the relevant progress in realizing topological states of matter within acoustic wave systems and introduces the work on non-reciprocal topological transport waveguides. Based on acoustic quantum Hall effect topological insulators, this work constructs a non-reciprocal scattering network and achieves non-reciprocal topological waveguide states. By introducing two types of domain walls into the acoustic insulator, a three-layer acoustic heterostructure is formed to compose the non-reciprocal scattering network, creating topological waveguide modes that span across interlayer domains. These modes enable functionalities such as non-reciprocal acoustic splitting and multi-channel transmission. This research not only enhances the robustness of acoustic non-reciprocal transmission but also effectively broadens the transmission pathways in two-dimensional topological systems and achieves effective control over non-reciprocal frequency bands.

Main paper/arXiv, related to the seminar, and other references

R. Dong, Y. Zhu, D. Mao, X. Wang, and Y. Li, Topological non-reciprocal robust waveguide transport, Sci. China-Phys. Mech. Astron. 67, 254311 (2024), https://doi.org/10.1007/s11433-023-2321-9