RT Journal Article
T1 Subwavelength acoustic valley-hall topological insulators using soda cans honeycomb lattices
A1 Zhang, Zhiwang
A1 Gu, Ye
A1 Long, Houyou
A1 Cheng, Ying
A1 Liu, Xiaojun
A1 Christensen, Johan
AB Topological valley-contrasting physics has attracted great attention in exploring the use of the valley degree of freedom as apromising carrier of information. Recently, this concept has been extended to acoustic systems to obtain nonbackscattering soundpropagations. However, previous demonstrations are limited by the cut-of frequency of 2D waveguides and lattice-scale sizerestrictions since the topological edge states originate from Bragg interference. Here we engineer topologically valley-projected edgestates in the form of spoof surface acoustic waves that confne along the surface of a subwavelength honeycomb lattice composedof 330-mL soda cans. Te inversion symmetry is broken through injecting a certain amount of water into one of the two cansin each unit cell, which gaps the Dirac cone and ultimately leads to the topological valley-Hall phase transition. Dual-frequencyranges of the valley-projected edge states below the sound line are observed, which originate from the frst-order and second-orderresonances, respectively. Tese results have the potential to enable promising routes to design integrated acoustic devices based onvalley-contrasting physics.
PB American Association for the Advancement of Science
SN 2096-5168
YR 2019
FD 2019-08-08
LK https://hdl.handle.net/10016/31596
UL https://hdl.handle.net/10016/31596
LA eng
NO This work was supported by National Key R&D Program of China (2017YFA0303702), NSFC (11834008, 11874215, 11674172, and 11574148), Jiangsu Provincial NSF (BK20160018), the Fundamental Research Funds for the Central Universities (020414380001), and Nanjing University Innovation and Creative Program for PhD candidate (CXCY17-11). Zhiwang Zhang acknowledges the support from the China Scholarship Council. Johan Christensen acknowledges the support from the EuropeanResearch Council (ERC) through the Starting Grant 714577 PHONOMETA and from the MINECO through a Ramón y Cajal grant (Grant no. RYC-2015-17156).
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RD 17 jul. 2024