Boundary-induced helical bulk acoustic transport in LiNbO3 thin films
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arXiv
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| Hauptverfasser: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918518826467328 |
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| author | Li, Zhe Qin, Zhen-Hui Wu, Shu-Mao Hao, Chen-Bei Pan, Fan-Yun Yan, Hao He, Yi-Han Zhou, Yan-Shen Yan, Xue-Jun Yu, Si-Yuan He, Cheng Lu, Ming-Hui Chen, Yan-Feng |
| author_facet | Li, Zhe Qin, Zhen-Hui Wu, Shu-Mao Hao, Chen-Bei Pan, Fan-Yun Yan, Hao He, Yi-Han Zhou, Yan-Shen Yan, Xue-Jun Yu, Si-Yuan He, Cheng Lu, Ming-Hui Chen, Yan-Feng |
| contents | We experimentally demonstrate boundary-induced helical bulk states (BI-HBSs) for RF acoustic transport in LiNbO3 thin-film phononic crystals (approximately 175-200 MHz). A boundary-symmetry selection rule at an accidental Γ-point fourfold degeneracy creates interior bulk channels that couple to wide-aperture interdigital transducers without edge-aperture mismatch. Near-field vibrometry and two-port RF S-parameters confirm low-loss propagation with strongly suppressed backscattering through wavelength-scale defects. The helical band also provides slow-wave, low-dispersion delay and phase control on chip. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_18385 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Boundary-induced helical bulk acoustic transport in LiNbO3 thin films Li, Zhe Qin, Zhen-Hui Wu, Shu-Mao Hao, Chen-Bei Pan, Fan-Yun Yan, Hao He, Yi-Han Zhou, Yan-Shen Yan, Xue-Jun Yu, Si-Yuan He, Cheng Lu, Ming-Hui Chen, Yan-Feng Applied Physics Mesoscale and Nanoscale Physics Materials Science We experimentally demonstrate boundary-induced helical bulk states (BI-HBSs) for RF acoustic transport in LiNbO3 thin-film phononic crystals (approximately 175-200 MHz). A boundary-symmetry selection rule at an accidental Γ-point fourfold degeneracy creates interior bulk channels that couple to wide-aperture interdigital transducers without edge-aperture mismatch. Near-field vibrometry and two-port RF S-parameters confirm low-loss propagation with strongly suppressed backscattering through wavelength-scale defects. The helical band also provides slow-wave, low-dispersion delay and phase control on chip. |
| title | Boundary-induced helical bulk acoustic transport in LiNbO3 thin films |
| topic | Applied Physics Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2502.18385 |