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      Controlling sound with acoustic metamaterials

      , ,
      Nature Reviews Materials
      Springer Nature

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          Locally resonant sonic materials

          Liu, Zhang, Mao (2000)
          We have fabricated sonic crystals, based on the idea of localized resonant structures, that exhibit spectral gaps with a lattice constant two orders of magnitude smaller than the relevant wavelength. Disordered composites made from such localized resonant structures behave as a material with effective negative elastic constants and a total wave reflector within certain tunable sonic frequency ranges. A 2-centimeter slab of this composite material is shown to break the conventional mass-density law of sound transmission by one or more orders of magnitude at 400 hertz.
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            Topological photonics

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              Is Open Access

              Real Spectra in Non-Hermitian Hamiltonians Having PT Symmetry

              The condition of self-adjointness ensures that the eigenvalues of a Hamiltonian are real and bounded below. Replacing this condition by the weaker condition of \({\cal PT}\) symmetry, one obtains new infinite classes of complex Hamiltonians whose spectra are also real and positive. These \({\cal PT}\) symmetric theories may be viewed as analytic continuations of conventional theories from real to complex phase space. This paper describes the unusual classical and quantum properties of these theories.
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                Author and article information

                Journal
                Nature Reviews Materials
                Nat. Rev. Mater.
                Springer Nature
                2058-8437
                February 16 2016
                February 16 2016
                : 1
                : 3
                : 16001
                Article
                10.1038/natrevmats.2016.1
                6213c94e-745e-4004-9614-c23b39bb6c56
                © 2016
                History

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