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Showing 1–13 of 13 results
Advanced filters: Author: "Johan Christensen" Clear advanced filters

  • The Airy-Talbot effect is experimentally demonstrated for spoof surface acoustic waves in a structured metasurface. Owing to its self-imaging and self-healing properties, the authors achieve robust multipath transmission of nonperiodic signals.

    • Hao-xiang Li
    • Jing-jing Liu
    • Johan Christensen
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-7

  • Typically, sending sound from transmitter to receiver requires pre-amplification and disturbs the surrounding sound environment. Here, the authors present a metamaterial designed to enable transmission of weak sound that can be recovered even in the presence of strong noise

    • Jin Zhang
    • Wei Rui
    • Johan Christensen
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-8

  • Active metamaterials can host non-Hermitian interactions that defy the conservation laws of linear elasticity, leading to unusual phenomena such as one-way energy transmission and odd-elastic moduli. Here, robust unidirectional Rayleigh surface waves are found in active media comprising both gyroscopic and odd-elastic effects.

    • Penglin Gao
    • Yegao Qu
    • Johan Christensen
    ResearchOpen Access
    Communications Materials
    Volume: 3, P: 1-6

  • An acoustic topological gallery insulator constructed from sonic crystals made of thermoplastic rods decorated with carbon nanotube films enables the out-coupling of amplified and focused sound at audible frequencies.

    • Bolun Hu
    • Zhiwang Zhang
    • Johan Christensen
    Research
    Nature
    Volume: 597, P: 655-659

  • Higher-order topological insulators are a class of systems where the relationship between the bulk and surface properties differ from that of conventional topological insulators. Here, the authors seek to demonstrate that these systems may be realized using acoustic systems.

    • María Rosendo López
    • Zhiwang Zhang
    • Johan Christensen
    ResearchOpen Access
    Communications Physics
    Volume: 2, P: 1-7

  • Localized zero-energy fermionic states can bind to topological defects such as two-dimensional vortices, which can be realized in the bulk of artificial acoustic and optical lattices.

    • Penglin Gao
    • Johan Christensen
    News & Views
    Nature Nanotechnology
    Volume: 16, P: 487-489

  • The intriguing physics of correlated flat bands in moiré superlattices can be mimicked, in classical physics, by twisted acoustic plates with periodic holes. Here, the authors derive a combined analytical and numerical approach that provides computational advantage in band engineering of holey bilayer plates.

    • María Rosendo López
    • Zhiwang Zhang
    • Johan Christensen
    ResearchOpen Access
    Communications Materials
    Volume: 3, P: 1-8

  • The current state of the art of topological phenomena in photonics and acoustics is reviewed and future research directions for valuable applications are discussed.

    • Xiujuan Zhang
    • Farzad Zangeneh-Nejad
    • Johan Christensen
    Reviews
    Nature
    Volume: 618, P: 687-697

  • Mechanical metamaterials exhibit exotic properties that cannot be realized in conventional materials. In this Review, recently developed shape-morphing, topological and nonlinear metamaterials are discussed together with their functionalities and design principles, and future challenges for the field are outlined.

    • Katia Bertoldi
    • Vincenzo Vitelli
    • Martin van Hecke
    Reviews
    Nature Reviews Materials
    Volume: 2, P: 1-11

  • Non-trivial topological states of matter are of interest due to the unusual physics which they exhibit. Here, using numerical simulations, the authors propose a 3D metamaterial consisting of granular beads, which host exotic interlaced and intersecting loop-degeneracies in momentum space that are accompanied by topologically protected surface states.

    • Aurélien Merkel
    • Johan Christensen
    ResearchOpen Access
    Communications Physics
    Volume: 2, P: 1-6

  • For both fundamental and applied sciences topological states of matter is an area of intense research and most investigations are dedicated to realizing these materials using electronic and optical methods. Here the authors review recent efforts in a third avenue of research which seeks to emulate topological states using acoustics.

    • Xiujuan Zhang
    • Meng Xiao
    • Johan Christensen
    ReviewsOpen Access
    Communications Physics
    Volume: 1, P: 1-13