Topological acoustics
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TLDR
In this paper , the authors survey the fundamental mechanisms, basic designs and practical realizations of topological phases in acoustic systems and provide an overview of future directions and potential applications for topological acoustic systems.Abstract:
Topological acoustics is an emerging field that lies at the intersection of condensed matter physics, mechanical structural design and acoustics engineering. It explores the design and construction of novel artificial structures, such as acoustic metamaterials and phononic crystals, to manipulate sound waves robustly, taking advantage of topological protection. Early work on topological acoustics was limited to duplicating topological phases that have been understood in condensed matter systems, but recent advances have shifted to exploring new topological concepts that are difficult to realize in other physical systems, such as various topological semimetal phases, and topological phases associated with Floquet engineering, fragile topology, non-Hermiticity and synthetic dimensions. These developments demonstrate the unique advantages of topological acoustic systems and their role in developing topological physics. In this Review, we survey the fundamental mechanisms, basic designs and practical realizations of topological phases in acoustic systems and provide an overview of future directions and potential applications. The introduction of topology into acoustic platforms enables robust sound control. This Review discusses the fundamental mechanisms, basic designs, practical realizations and promising future directions for topological acoustic systems. read more
Citations
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Transient non-Hermitian skin effect
TL;DR: Li et al. as discussed by the authors used complex-frequency excitation to create virtual gain effect, and experimentally demonstrate that exact NHSE can persist in a totally passive system during a quasi-stationary stage.
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Topological phonons in Cs-Te binary systems
TL;DR: In this article , the authors used symmetry analysis and first-principles calculations to discover seven Cs-Te binary systems that have different crystal structures and can host symmetry-enforced topologically nontrivial phonons.
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Emerging topics in nanophononics and elastic, acoustic, and mechanical metamaterials: an overview
Anastasiia Krushynska,Daniel Torrent,Alejandro M. Aragón,Raffaele Ardito,Osama R. Bilal,Bernard Bonello,Federico Bosia,Yi Chen,Johan Christensen,Andrea Colombi,Steven A. Cummer,Bahram Djafari-Rouhani,Fernando Fraternali,Pavel I. Galich,Pedro García,Jean-Philippe Groby,Sébastien Guenneau,Michael R. Haberman,Mahmoud I. Hussein,S. Janbaz,Noé Jiménez,Abdelkrim Khelif,Vincent Laude,Mohammad J. Mirzaali,Pawel Packo,Antonio Palermo,Yan Pennec,Rubén Picó,María Rosendo López,Stephan Rudykh,Marc Serra-Garcia,C. M. Sotomayor Torres,Timothy A. Starkey,Vincent Tournat,Oliver B. Wright +34 more
TL;DR: A broad review of recent advances and hot research topics in nanophononics and elastic, acoustic, and mechanical metamaterials based on results presented by the authors at the EUROMECH 610 Colloquium held on April 25-27, 2022 in Benicássim, Spain is presented in this article .
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Classification of time-reversal-invariant crystals with gauge structures
TL;DR: In this paper , a unified theory for projective symmetry algebras of time-reversal-invariant crystals is established by exhaustively classifying and representing all 458 projective symmetries of time invariant crystals from 17 wallpaper groups in two dimensions.
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Optimal design of topological waveguides by machine learning
TL;DR: In this article , artificial neural networks (ANN) are trained to predict the topological property and the bounds of nontrivial bandgaps, and a mathematical formulation for designing optimal mechanical topological waveguides with a large working bandwidth and highly localized interface mode is presented.
References
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Journal ArticleDOI
Colloquium: Topological insulators
M. Z. Hasan,Charles L. Kane +1 more
TL;DR: In this paper, the theoretical foundation for topological insulators and superconductors is reviewed and recent experiments are described in which the signatures of topologically insulators have been observed.
Journal ArticleDOI
Topological insulators and superconductors
Xiao-Liang Qi,Shou-Cheng Zhang +1 more
TL;DR: Topological superconductors are new states of quantum matter which cannot be adiabatically connected to conventional insulators and semiconductors and are characterized by a full insulating gap in the bulk and gapless edge or surface states which are protected by time reversal symmetry.
Journal ArticleDOI
Quantal phase factors accompanying adiabatic changes
TL;DR: In this article, it was shown that the Aharonov-Bohm effect can be interpreted as a geometrical phase factor and a general formula for γ(C) was derived in terms of the spectrum and eigen states of the Hamiltonian over a surface spanning C.
Journal ArticleDOI
Quantum spin Hall effect in graphene
Charles L. Kane,Eugene J. Mele +1 more
TL;DR: Graphene is converted from an ideal two-dimensional semimetallic state to a quantum spin Hall insulator and the spin and charge conductances in these edge states are calculated and the effects of temperature, chemical potential, Rashba coupling, disorder, and symmetry breaking fields are discussed.
Journal ArticleDOI
New Method for High-Accuracy Determination of the Fine-Structure Constant Based on Quantized Hall Resistance
TL;DR: In this article, the Hall voltage of a two-dimensional electron gas, realized with a silicon metal-oxide-semiconductor field effect transistor, was measured and it was shown that the Hall resistance at particular, experimentally well-defined surface carrier concentrations has fixed values which depend only on the fine-structure constant and speed of light, and is insensitive to the geometry of the device.