Journal ArticleDOI
Surface phononic graphene.
Si-Yuan Yu,Xiaochen Sun,Xu Ni,Qing Wang,Xue-Jun Yan,Cheng He,Xiaoping Liu,Liang Feng,Ming-Hui Lu,Yan-Feng Chen +9 more
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TLDR
The demonstrated fully integrated artificial phononic graphene platform here constitutes a step towards on-chip quantum simulators of graphene and unique monolithic electro-acoustic integrated circuits.Abstract:
Strategic manipulation of wave and particle transport in various media is the key driving force for modern information processing and communication. In a strongly scattering medium, waves and particles exhibit versatile transport characteristics such as localization, tunnelling with exponential decay, ballistic, and diffusion behaviours due to dynamical multiple scattering from strong scatters or impurities. Recent investigations of graphene have offered a unique approach, from a quantum point of view, to design the dispersion of electrons on demand, enabling relativistic massless Dirac quasiparticles, and thus inducing low-loss transport either ballistically or diffusively. Here, we report an experimental demonstration of an artificial phononic graphene tailored for surface phonons on a LiNbO3 integrated platform. The system exhibits Dirac quasiparticle-like transport, that is, pseudo-diffusion at the Dirac point, which gives rise to a thickness-independent temporal beating for transmitted pulses, an analogue of Zitterbewegung effects. The demonstrated fully integrated artificial phononic graphene platform here constitutes a step towards on-chip quantum simulators of graphene and unique monolithic electro-acoustic integrated circuits.read more
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Topological phases in acoustic and mechanical systems
TL;DR: In this paper, the essential physical concepts that underpin various classes of topological phenomena realized in acoustic and mechanical systems are introduced, including Dirac points, the quantum Hall, quantum spin Hall and valley Hall effects, Floquet topological phases, 3D gapless states and Weyl crystals.
Journal ArticleDOI
Artificial gauge fields in materials and engineered systems
Monika Aidelsburger,Monika Aidelsburger,Monika Aidelsburger,Sylvain Nascimbene,Nathan Goldman +4 more
TL;DR: In this paper, the authors present a review of various forms of artificial electromagnetic fields and spin-orbit couplings for matter and light and connect different communities, by revealing explicit links between the diverse forms and realizations of artificial gauge fields.
Journal ArticleDOI
Breaking the barriers: advances in acoustic functional materials
TL;DR: In this article, the authors present a review of recent developments in the field of acoustic metamaterials, including zero/negative refraction, subwavelength imaging, sound cloaking, total sound absorption, metasurface and phase engineering, Dirac physics and topology-inspired acoustic engineering, non-Hermitian parity-time synthetic active active metammaterials, and one-way propagation of sound waves.
Journal ArticleDOI
Electrical tuning of elastic wave propagation in nanomechanical lattices at MHz frequencies.
Jinwoong Cha,Chiara Daraio +1 more
TL;DR: One-dimensional, non-linear, nanoelectromechanical lattices (NEML) with active control of the frequency band dispersion in the radio-frequency domain (10–30 MHz), inspired by NEMS-based phonon waveguides, and includes the voltage-induced frequency tuning of the individual resonators.
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Physics of surface vibrational resonances: pillared phononic crystals, metamaterials, and metasurfaces.
Yabin Jin,Yan Pennec,Bernard Bonello,Hossein Honarvar,Leonard Dobrzynski,Bahram Djafari-Rouhani,Mahmoud I. Hussein +6 more
TL;DR: The history and development of pillared materials are overviewed, a detailed synopsis of a selection of key research topics that involve the utilization of pillars or similar branching substructures in different contexts are provided, and some perspectives on the state of the field are provided.
References
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Journal ArticleDOI
Observing Zitterbewegung with Ultracold Atoms
J. Y. Vaishnav,Charles W. Clark +1 more
TL;DR: In this article, an optical lattice scheme was proposed for the experimental observation of Zitterbewegung (ZB) with ultracold, neutral atoms, and it was shown that the ZB should occur at experimentally accessible frequencies and amplitudes.
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Dirac cones in two-dimensional artificial crystals for classical waves
TL;DR: In this article, the existence of Dirac cones in two-dimensional phononic crystals was studied and it was shown that part of the symmetries can support Dirac cone stably, while the others cannot.
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Topological transition of Dirac points in a microwave experiment.
TL;DR: A topological transition between a phase with a pointlike band gap characteristic of massless Dirac fermions and a gapped phase is observed and it is found that with increasing anisotropy, these new states are more and more localized at the edges.
Journal ArticleDOI
Acoustic analogue of graphene: observation of Dirac cones in acoustic surface waves.
TL;DR: It is demonstrated the presence of Dirac cones in the dispersion relation of acoustic waves propagating on the surface of a plate of methyl methacrylate containing a honeycomb lattice of cylindrical boreholes, which represents the acoustic analogue of graphene.