Demultiplexing sound in stacked valley-Hall topological insulators

Xiong, Wei; Gao, Penglin; Zhang, Zhiwang; Yue, Zichong; Zhang, Haixiao; Cheng, Ying; Liu, Xiaojun; Christensen, Johan

doi:10.1103/physrevb.104.224108

Cited by 10 publications

(6 citation statements)

References 26 publications

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“…Adapted from [209], with permission from Springer Nature. phononic crystals of square lattice [245,246], and further to heterostructures with Dirac materials inserted into the interface [247] and stacked structures supporting demultiplexing sound waves [248].…”

Section: Valley and Spin Hall Phononic Crystalsmentioning

confidence: 99%

Topological phononic metamaterials

Zhu,

Deng,

Liu

et al. 2023

Rep. Prog. Phys.

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The concept of topological energy bands and their manifestations have been demonstrated in condensed matter systems as a fantastic paradigm toward unprecedented physical phenomena and properties that are robust against disorders. Recent years, this paradigm was extended to phononic metamaterials (including mechanical and acoustic metamaterials), giving rise to the discovery of remarkable phenomena that were not observed elsewhere thanks to the extraordinary controllability and tunability of phononic metamaterials as well as versatile measuring techniques. These phenomena include, but not limited to, topological negative refraction, topological `sasers' (i.e., the phononic analog of lasers), higher-order topological insulating states, non-Abelian topological phases, higher-order Weyl semimetal phases, Majorana-like modes in Dirac vortex structures and fragile topological phases with spectral flows. Here we review the developments in the field of topological phononic metamaterials from both theoretical and experimental perspectives with emphasis on the underlying physics principles. To give a broad view of topological phononics, we also discuss the synergy with non-Hermitian effects and cover topics including synthetic dimensions, artificial gauge fields, Floquet topological acoustics, bulk topological transport, topological pumping, and topological active matters as well as potential applications, materials fabrications and measurements of topological phononic metamaterials. Finally, we discuss the challenges, opportunities and future developments in this intriguing field and its potential impact on physics and materials science.

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Section: Valley and Spin Hall Phononic Crystalsmentioning

confidence: 99%

Topological phononic metamaterials

Zhu,

Deng,

Liu

et al. 2023

Rep. Prog. Phys.

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“…However, when the working band of the edge state moves into the high-frequency region gradually, the output wave vectors of the topological refraction are beyond the range of the 1st Brillouin zone of the VSCs. Thus, the output sound energy is featured as the form of a double-beam or multi-beam topological refraction based on the phase-matching condition [23,26,27], which becomes an obstacle for designing robust directional antennas and communication devices in the high-frequency band.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to its robust valley transports, topological refractions of valley edge states from an impedance-mismatched zigzag interface between the VSCs and external medium have also become a hot topic in acoustics [21][22][23][24][25][26][27], which has a unique advantage of reflection-free sound refraction owing to the suppression of intervalley scattering. In previously demonstrated topological refractions, when the output wave vector of topological refractions is in the range of the 1st Brillouin zone of the VSCs, a single-beam topological refraction is generally obtained in topological waveguides composed of two VSCs, providing the feasibility of designing a directional acoustic antenna [21,22,24,25].…”

Section: Introductionmentioning

confidence: 99%

Acoustic suppressed topological refraction in valley sonic crystals

Wang

Ding

et al. 2022

New J. Phys.

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We report both experimentally and numerically that an acoustic suppressed topological refraction is realized by two kagome-lattice valley sonic crystals (VSCs). By simply rotating triangle rods in the VSCs, acoustic valley Hall phase transitions can be obtained. In a designed topological waveguide composed of two VSCs with distinct valley topological phases, two types of valley edge states can be observed in the domain wall. Furthermore, the topological waveguide can support a suppressed topological refraction of sound, which arises from the excitation of an acoustic dipole mode at the exit of the domain wall. Such a phenomenon is experimentally demonstrated by scanning topological refractions of the edge states from a zigzag termination, in which the theoretical prediction of a negative refraction almost overlaps with the perpendicular bisector of the dipole mode, and thus it is suppressed totally. Finally, the robustness of the suppressed topological refraction is demonstrated experimentally. Our work can find potential applications in designing the devices of robust directional sound transports and communications.

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“…In recent years, how to control the propagation of sound waves through arbitrary pathway in a network has been a very challenging subject. Inspired by the electronic edge states occurring in topological insulators 18,19 , the concept of topological acoustics has been proposed 20 , and the phenomenon of disorder-free, one-way sound propagation has been experimentally demonstrated [21][22][23][24][25] . Besides, the combination of a symmetry-breaking, cross-shaped metamaterial comprising Helmholtz resonant cells and an eccentrically arranged square column can also lead to quasilossless acoustic transmission in an arbitrary pathway of a network 26 .…”

mentioning

confidence: 99%

Total acoustic transmission in a honeycomb network empowered by compact acoustic isolator

Zhang

Bao

et al. 2023

Sci Rep

Self Cite

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In recent years, acoustic metamaterials have exhibited extraordinary potential for manipulating the propagation of sound waves. However, it has been a challenge to control the propagation of sound waves through arbitrary pathways in a network. In this work, we designed a compact three-port isolator that can produce giant acoustic nonreciprocity by introducing actively controlled CNT films to the device without altering the geometric symmetry of it. This concept is subsequently applied to construct a 4 × 7 honeycomb network, in which, total transmission of sound wave in arbitrary pathway can be slickly achieved. Unlike the acoustic topological insulator, which only supports total transmission of arbitrary pathway in the band gap, our method provides more degrees of freedom and can be realized at any frequency. This ability opens up a new method for routing sound waves and exhibits promising applications ranging from acoustic communication to energy transmission.

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Demultiplexing sound in stacked valley-Hall topological insulators

Cited by 10 publications

References 26 publications

Topological phononic metamaterials

Topological phononic metamaterials

Acoustic suppressed topological refraction in valley sonic crystals

Total acoustic transmission in a honeycomb network empowered by compact acoustic isolator

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