Results 11 to 20 of about 575 (159)
Observation of an acoustic octupole topological insulator [PDF]
Nature Communications, 2020 The concept of topological corner states in two dimensional topological insulators can be generalised to higher dimensions. Here, authors present a three dimensional acoustic metamaterial that exhibits the full hierarchy of topological multipole states ...
Haoran Xue +8 more
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Acoustic analogues of three-dimensional topological insulators [PDF]
Nature Communications, 2020 An acoustic analogue of a three-dimensional topological insulator (TI) has not been achieved, despite various realizations in other kinds of TIs. Here, the authors report a three-dimensional multi-order TI in an acoustic bilayer chiral structure, with ...
Cheng He +6 more
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Demonstration of a quantized acoustic octupole topological insulator [PDF]
Nature Communications, 2020 Although multipole topological insulators have been theoretically described and experimentally observed in 2D, third-order topological insulators in 3D have not been observed yet.
Xiang Ni +4 more
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Acoustic Realization of Quadrupole Topological Insulators [PDF]
Physical Review Letters, 2020 A quadrupole topological insulator, being one higher-order topological insulator with nontrivial quadrupole quantization, has been intensely investigated very recently. However, the tight-binding model proposed for such emergent topological insulators demands both positive and negative hopping coefficients, which imposes an obstacle in practical ...
Yajuan Qi +5 more
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Additive manufacturing of channeled acoustic topological insulators [PDF]
The Journal of the Acoustical Society of America, 2021 We propose and fabricate an acoustic topological insulator to channel sound along statically reconfigurable pathways. The proposed topological insulator exploits additive manufacturing to create unit cells with complex geometry designed to introduce topological behavior while reducing attenuation.
Emily Kliewer +2 more
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Dirac Hierarchy in Acoustic Topological Insulators
Physical Review Letters, 2021 Dirac cones are essential features of the electronic band structure of materials like graphene and topological insulators (TIs). Lately, this avenue has found a growing interest in classical wave physics by using engineered artificial lattices. Here, we demonstrate an acoustic 3D honeycomb lattice that features a Dirac hierarchy comprising an eightfold
Zheng, Li-Yang, Christensen, Johan
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Acoustic edge mode in spiral-based metamaterials at subwavelength scale
Results in Physics, 2022 Recently, the quantum effect of condensed matter physics is introduced into the acoustic field, which lays a new pathway to manipulate the acoustic wave.
Tao Yang +8 more
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3D Hinge Transport in Acoustic Higher-Order Topological Insulators [PDF]
Physical Review Letters, 2021 The discovery of topologically protected boundary states in topological insulators opens a new avenue toward exploring novel transport phenomena. The one-way feature of boundary states against disorders and impurities prospects great potential in applications of electronic and classical wave devices.
Qiang Wei +8 more
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Probing of the topological phase transition in a disordered 1D acoustic system
AIP Advances, 2022 The methods to determine the Zak phase introduced by previous studies are usually limited to the periodic systems protected by the inversion symmetry. In this work, we build a one-dimensional chiral symmetric acoustic chain with controllable disorder to ...
Shi-Feng Li +4 more
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Acoustic and photonic topological insulators by topology optimization [PDF]
Metamaterials, Metadevices, and Metasystems 2019, 2019 The preliminary study reported here investigates if unit-cell inclusion-symmetries may be broken in time-reversalinvariant topological insulator designs, while maintaining the desired global behaviour of pseudo-spin-dependent edge state based bi-directional, back-scattering robust, energy propagation.
Christiansen, Rasmus E.; id_orcid 0000-0003-4969-9062 +3 more
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