Broadband acoustic pseudospin topological states based on the reverse spin-orbit coupling in generalized insulators

IF 2.6 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Chongrui Liu, Yibing Lu, Zhenxin He, Wenliang Guan, Zhen Huang
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引用次数: 0

Abstract

Acoustic topological insulators have the excellent characteristic of the pseudospin-dependent one-way transmission of sound edge states immune to backscattering. We realize the broadband acoustic pseudospin topological edge states with subwavelength generalized topological insulators, which is achieved by reverse pseudospin-orbit coupling. The subwavelength band and broadband nontrivial bandgap can be achieved by adjusting the topological structure of the scatterers and introducing resonators. The results demonstrate that the resonator can significantly reduce the frequencies of p-states and d-states by introducing resonance scattering; the scattering size and rotation angles change the frequencies of p-states and d-states in opposite directions by adjusting the distribution of the sound field. Then, we experimentally realize the pseudospin-dependent one-way transmission of sound edge states along the interface separating phononic crystals with distinct topological phases. Our research provides a systematic scheme for the design of acoustic topological insulators with versatile applications.
基于广义绝缘体中反向自旋轨道耦合的宽带声学伪时空拓扑态
声学拓扑绝缘体具有不受反向散射影响的、依赖于伪空间的单向声边缘态传输的优异特性。我们用亚波长广义拓扑绝缘体实现了宽带声学伪ospin拓扑边缘态,这是通过反向伪ospin轨道耦合实现的。通过调整散射体的拓扑结构和引入谐振器,可以实现亚波长带和宽带非奇异带隙。结果表明,通过引入共振散射,共振器可以显著降低p-态和d-态的频率;通过调整声场分布,散射大小和旋转角度可以改变p-态和d-态的频率,使其向相反的方向变化。然后,我们通过实验实现了声边态沿具有不同拓扑相的声子晶体分界面的伪空间依赖性单向传输。我们的研究为设计用途广泛的声拓扑绝缘体提供了一个系统方案。
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来源期刊
Frontiers in Materials
Frontiers in Materials Materials Science-Materials Science (miscellaneous)
CiteScore
4.80
自引率
6.20%
发文量
749
审稿时长
12 weeks
期刊介绍: Frontiers in Materials is a high visibility journal publishing rigorously peer-reviewed research across the entire breadth of materials science and engineering. This interdisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers across academia and industry, and the public worldwide. Founded upon a research community driven approach, this Journal provides a balanced and comprehensive offering of Specialty Sections, each of which has a dedicated Editorial Board of leading experts in the respective field.
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