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Since the expansion of the topological insulator concept from the field of quantum waves to the field of elastic waves, the research related to the elastic system valley hall insulator has been developed rapidly because of its novel physical properties, rich designability for wave modulation and simple implementation conditions. To address the limitations of small energy and inflexible structure of the edge-state transmission of valley hall insulators in general, a topological waveguide heterostructure is designed based on the valley locking principle. The original configuration of the structure has a vein-connected honeycomb lattice. Using the equivalent structural parameter method to calculate the energy band structure and transmission characteristics of the model, it is found that there are three Dirac points at the corner points K of the Brillouin zone, and the spatial inversion symmetry of the system can be broken by changing the structural parameters, so as to realize the topological phase transition of the out-of-plane body elastic mode in three frequency bands; between two topological insulators The topological heterogeneous structure is formed by superimposing Dirac point phonon crystals between two topological insulators, and the topological waveguide state is multiband, tunable, and robust, etc. The structure is used to design energy splitters and energy convergers to achieve flexible manipulation of elastic waves. This study enriches topological acoustics, and the designed multi-band elastic topological insulator has potential applications in multi-band communication and information processing.
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Keywords:
- Phononic crystals /
- elastic waves /
- topological waveguide states /
- multiband
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[1] Bernevig B A, Hughes T L, Zhang S C 2006 Science 314 1757
[2] Moore J E 2010 Nature 464 194
[3] He C, Ni X, Ge H, Sun X C, Chen Y B, Lu M H, Liu X P, Chen Y F 2016 Nat. Phys. 12 1124
[4] Miniaci M, Pal R, Morvan B, Ruzzene M 2018 Phys. Rev. X 8 031074
[5] Zhou W J, Wu B, Su Y, Liu D Y, Chen W Q, Bao R H 2021 Mech. Adv. Mater. Struct. 28 221
[6] Zeng Y, Zhang S Y, Zhou H T, Wang Y F, Cao L Y, Zhu Y F, Du Q J, Assouar B, Wang Y S 2021 Mater. Des. 208 109906
[7] Wang K, Zhou J X, Chang Y P, Ouyang H J, Xu D L, Yang Y 2020 Nonlinear Dyn. 101 755
[8] Ding Y, Peng Y, Zhu Y, Fan X, Yang J, Liang B, Zhu X, Wan X, Cheng J 2019 Phys. Rev. Lett. 122 014302
[9] Yang Z J, Gao F, Shi X H, Lin X, Gao Z, Chong Y D, Zhang B L 2015 Phys. Rev. Lett. 114 114301
[10] Wang P, Lu L, Bertoldi K 2015 Phys. Rev. Lett. 115 104302
[11] Gao N, Qu S C, Si L, Wang J, Chen W Q 2021 Appl. Phys. Lett. 118063502
[12] Chen Y F, Meng F, Huang X D 2021 Mech. Syst. Signal Process. 146 107054
[13] Huo S Y, Chen J J, Huang H B, Wei Y J, Tan Z H, Feng L Y, Xie X P 2021 Mech. Syst. Signal Process. 154 107543
[14] Lu J Y, Qiu C Y, Ye L P, Fan X Y, Ke M Z, Zhang F, Liu Z Y 2017 Nat. Phys. 13 369
[15] Brendel C, Peano V, Painter O, Marquardt F 2018 Phys. Rev. B 97 020102
[16] Lin J, Qi Y, He Z 2024Appl. Phys. Lett.124082202
[17] Yi-He W, Zhi-Wang Z, Ying 2019Acta Phys. Sin. 68 264-271(in Chinese) [王一鹤,张志旺,程营2019. 68264-271]
[18] Ding J, Yong G, Shou-Qi Y, Hong-Xiang S 2019 Acta Phys. Sin. 68224301 (in Chinese) [贾鼎, 葛勇, 袁寿其, 孙宏祥2019 68 224301]
[19] Zhou-Fu Z, Jian-Fei Y, Ji-Hong W, Dian-Long Y 2020 Acta Phys. Sin. 69 279(in Chinese) [郑周甫，尹剑飞, 温激鸿, 郁殿龙2020 69 279]
[20] Jiang Z, Zhou Y Y, Zheng S J, Liu J T, Xia B Z 2023 Int. J. Mech. Sci. 255 108464
[21] Huo S, Chen J, Huang H, 2017Sci. Rep. 7 10335
[22] Yang Z Z, Li X, Peng Y Y, 2020, Phys. Rev. Lett. 125 255502.
[23] Xu G G, Sun X W, Wen X D 2023J Appl Phys. 133 095110
[24] Wang M D, Zhou W Y, Bi L, Qiu C Y, Ke M Z, Liu Z Y 2020 Nat. Commun. 11 3000
[25] Huo S Y, Xie G H, Qiu S J, Gong X C, Fan S Z, Fu C M, Li Z Y 2022 Mech. Adv. Mater. Struct. 29 7772
[26] Wang J Q, Zhang Z D, Yu S Y, Ge H, Liu K F, Wu T, Sun X C, Liu L, Chen H Y, He C 2022 Nat. Commun. 13 1324
[27] Liu S, Deng W Y, Huang X Q, Lu J Y, Ke M Z, Liu Z Y 2022 Phys. Rev. Appl. 18 034066
[28] Chen Y, Guo Z, Liu Y 2024J. Phys. D: Appl. Phys.57 465306.
[29] Wang Y F 2015Ph. D. Dissertation (Beijin: Beijinjiaotong University) (in Chinese) [王艳锋2015 博士论文(北京: 北京交通大学) ]
[30] Lai, Yun, Zhao-Qing Zhang.2003Appl. Phys. Lett. 83 3900-3902
[31] Mei J, Liu Z, Shi J 2003Phys. Rev.B.67 245107.
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