Results 131 to 140 of about 575 (159)
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Multichannel Topological Transport in an Acoustic Valley Hall Insulator
Physical Review Applied, 2021Valley interface states, resulting in acoustic valley Hall topological insulators, have recently become a hot topic in the study of acoustic systems. On the basis of structural diversity and potential applications, we construct a two-dimensional triangular-lattice phononic crystal with ${C}_{3v}$-symmetric scatterers, and obtain two distinct valley ...
Guojun Jin, Han Jia, Hai Yang
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Acoustic nonreciprocal topological insulators
The Journal of the Acoustical Society of America, 2019Nonreciprocal acoustic systems, in which the reciprocity obeyed by wave motion in conventional propagation media, offer the possibility to achieve asymmetric transmission and contain rich physics. The emergence of “acoustic rectifier” for the first time realized both theoretically and experimentally the non-reciprocal wave phenomenon that the acoustic ...
Bin Liang +5 more
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Observation of an acoustic topological Euler insulator with meronic waves
Science BulletinTopological band theory has conventionally been concerned with the topology of bands around a single gap. Only recently non-Abelian {topologies that thrive on involving multiple gaps} were studied, unveiling a new horizon {in topological physics} beyond the conventional paradigm.
Jian-Hua Jiang +2 more
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Hybrid Acoustic Topological Insulator in Three Dimensions
Physical Review Letters, 2019Topological insulators (TIs), featured by a symmetry-protected gapless surface Dirac cone(s) in their complete energy band gaps, have been extended from condensed-matter physics to classical bosonic systems in the last decade. However, acoustic TIs in three dimensions remain elusive because of a lack of a spin or polarization degree of freedom for ...
Cheng, He +7 more
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Microparticles separation using acoustic topological insulators
Applied Physics Letters, 2021Acoustic topological insulators have exotic states on their topological interfaces, which provide an extraordinary approach to control the sound wave with a backscattering-immune property. Non-contact particle manipulations play an important role in life science, and acoustic tweezers are gaining increasing attention due to their better biological ...
Hongqing Dai, Baizhan Xia, Dejie Yu
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Observations of Tamm modes in acoustic topological insulators
Applied Physics Letters, 2022The existence of topologically protected boundary states in the Su–Schrieffer–Heeger (SSH) model has been widely explored in various systems in the past decades. On the other hand, a seemingly irrelevant phenomenon of Tamm mode, a defect mode caused by elaborately introducing perturbation into the trivial structures, has also attracted enormous ...
Danwei Liao +5 more
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Acoustic topological insulators
Journal of the Acoustical Society of America, 2016The recent discovery of topological states in condensed matter physics has spawned a quest for similar effects in classical physics. Topological insulators are bulk insulators supporting bandgap crossing, chiral edge states that are immune to backscattering caused by defects or disorder.
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Helical Higher-Order Topological States in an Acoustic Crystalline Insulator
Physical Review Letters, 2020The topological states in quantum Hall insulators and quantum spin Hall insulators that emerge helical are considered nondissipative. However, in crystalline systems without spin-orbit couplings, the existing higher-order topological states are considered not helical, and the energy suffers from dissipation during propagation.
Zhangzhao Yang +2 more
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Piezoelectric Topological Insulators for Acoustic Waves
2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials), 2018We present topological insulators for surface acoustic waves on piezoelectric materials. Our structures are based on honeycomb lattices of different types of acoustic domains and derive their nontrivial topology by breaking the symmetry of the lattice hexagonal unit cells.
D. L. Sounas, A. Alu
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Tunable Nonlinear Topological Insulator for Acoustic Waves
Physical Review Applied, 2019Inspired by the quantum spin Hall effect, the authors propose a tunable nonlinear topological insulator for acoustic waves, which could be an ideal framework for lossless information transport. The band structure of the hexagonal unit cell is obtained analytically, using Bloch's theorem and zone-folding techniques, revealing doubly degenerate Dirac ...
Amir Darabi, Michael Leamy
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