首页|Topological non-reciprocal robust waveguide transport

Topological non-reciprocal robust waveguide transport

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Devices that surpass the restriction of reciprocity of classical physical waves have brought intriguing possibilities for wave mod-ulation.Non-reciprocal acoustic devices that rely on the viscosity of the medium or nonlinear effect have low efficiency and distortion problems respectively,and poor immunity to defects.The appearance of acoustic topological insulators achieves non-reciprocal transport with high robustness.However,the local nature of topological states means that their appearance depends on a system with a larger dimension.That is,most of the area of a topological device is occupied by useless lattices that do not directly contribute to non-reciprocal transport.The extra cost of topology protection severely limits the application scenar-ios of topology states,decreases the cost-effectiveness of topology devices,and is not conducive to device miniaturization and integration.In this work,we construct an acoustic three-layer heterojunction by introducing two types of domain walls into a conventional quantum Hall effect acoustic topological insulator,and successfully construct a non-reciprocal scattering network that forms topological modes spanning the interlayer domain.These extended states are still protected by bulk-band topology,making their non-reciprocity robust against disorder.This structure flawlessly realizes the path broadening in a two-dimensional topological system and can accomplish functions such as non-reciprocal acoustic splitting and multichannel transmission.Our work opens up opportunities for developing topological-insulator-based non-reciprocal devices in acoustics.

scattering networknon-reciprocal deviceswaveguide statetopological acoustics

Ruizhi Dong、Yihuan Zhu、Dongxing Mao、Xu Wang、Yong Li

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Institute of Acoustics,Tongji University,Shanghai 200092,China

National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaShanghai Science and Technology CommitteeFundamental Research Funds for the Central Universities

2022YFA14044002022YFA1404403120742881207428621JC1405600

2024

10.1007/s11433-023-2321-9

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(5)