2-bit topological-encoded acoustic multifunctional device

W. Xiong; Z. C. Yue; H. X. Zhang; Z. W. Zhang; Y. Cheng; X. J. Liu

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arXiv · 2104.10607

2-bit topological-encoded acoustic multifunctional device

W. Xiong·Z. C. Yue·H. X. Zhang·Z. W. Zhang·Y. Cheng·X. J. Liu

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Abstract

Valley degree of freedom, an excellent information carrier in valleytronics, has been further introduced into advanced microstructure systems for achieving the acoustic valley-Hall topological insulators (VHTIs), which host valley-projected edge states suppressing the undesired sound backscattering under certain perturbations. Therein, the majority of previous literatures focused on single frequency region, and the lack of capability of simultaneous multi-band operation with individual control radically impedes their potential applications. Here, a binary topological-encoded acoustic VHTI is investigated both theoretically and experimentally to manipulate each of the dual-band valley-projected edge states. Through arranging different coding elements derived from the combined valley-Chern numbers, the existence and propagation directions of the frequency selective edge states can be configured in corresponding frequency regions individually. On this basis, three types of proof-of-concept acoustic topological-encoded functional devices are designed, including frequency beam splitter, anti-interference demultiplex topological sensing and composite topological whispering gallery. Our proposal may provide versatile possibilities for achieving the integrated multifunctional systems in multi-channel signal processing and memorizing with high efficiency and high capacity.

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BibTeX RIS

W. Xiong, Z. C. Yue, H. X. Zhang, Z. W. Zhang, Y. Cheng, X. J. Liu. 2021-09-18. 2-bit topological-encoded acoustic multifunctional device. https://arxiv.org/abs/2104.10607

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