Metamaterials articles within Nature Physics

Featured

  • Research Briefing |

    Time crystals are a new state of matter. Conventional crystal properties are periodic in space, while the properties of a time crystal are periodic in time. A continuous quantum time crystal has recently been realized, and now, using optically driven many-body interactions in a nano-mechanical photonic metamaterial, a classical continuous time crystal has been created.

  • Article
    | Open Access

    So far, a continuous time crystal has only been implemented on a quantum system. Optically driven many-body interactions in a nanomechanical photonic metamaterial now allow the realization of a classical continuous time crystal.

    • Tongjun Liu
    • , Jun-Yu Ou
    •  & Nikolay I. Zheludev

  • Article
    | Open Access

    Ultrafast photon–electron spectroscopy commonly requires a driving laser. Now, an inverse approach based on cathodoluminescence spectroscopy has allowed a compact solution to spectral interferometry inside an electron microscope, without a laser.

    • Masoud Taleb
    • , Mario Hentschel
    •  & Nahid Talebi

  • Article |

    Artificial spin ice formed of nanomagnets arranged on a lattice mimics frustrated magnetism seen in condensed matter. By controlling magnetic interactions, theoretically predicted phase transitions are now observed in artificial kagome-lattice spin ice.

    • Kevin Hofhuis
    • , Sandra Helen Skjærvø
    •  & Laura Jane Heyderman

  • Article |

    A general approach to derive direction-dependent complex refractive indices close to zero produces infinite families of time-reversible and infinite families of time-irreversible electromagnetic materials, without invoking the concept of topology.

    • S. A. R. Horsley
    •  & M. Woolley

  • Editorial |

    Topology is everywhere. Recent predictions for and realizations of higher-order topological insulators are a case in point.

  • Letter |

    The demonstration of substantially enhanced high-harmonic emission from a silicon metasurface suggests a route towards novel photonic devices based on a combination of ultrafast strong-field physics and nanofabrication technology.

    • Hanzhe Liu
    • , Cheng Guo
    •  & David A. Reis

  • Letter |

    The authors theoretically investigate a novel form of a Doppler effect in homogeneous systems with positive refractive index that occurs under certain conditions. It is suggested that this Doppler effect can be experimentally separated from other Doppler effects by using polaritons such as those found in graphene.

    • Xihang Shi
    • , Xiao Lin
    •  & Baile Zhang

  • Article |

    Perfect transmission of sound waves through a strongly disordered environment is demonstrated using a set of speakers that provide exactly the right input to counteract scattering by the disorder. These principles can also be applied to light.

    • Etienne Rivet
    • , Andre Brandstötter
    •  & Romain Fleury

  • Letter |

    Coupling strengths differ between neighbours in square artificial spin ices, resulting in the loss of degeneracy. Introducing mesospins on vertices of the array alleviates this problem, by tuning the strength and ratio of the interaction energies.

    • Erik Östman
    • , Henry Stopfel
    •  & Björgvin Hjörvarsson

  • Research Highlights |

    • Luke Fleet

  • Research Highlights |

    • Bart Verberck

  • News & Views |

    Electrons moving in a one-dimensional crystal can acquire a geometrical phase. Sound waves in phononic crystals are now shown to display the same effect — underlining the similarity between conventional solids and acoustic metamaterials.

    • Julio T. Barreiro

  • Letter |

    The behaviour of sound waves in phononic crystals—metamaterials with spatially varying acoustic characteristics—is similar to that of electrons in solids. Now, phononic band inversion and Zak phases have been measured for a 1D phononic system.

    • Meng Xiao
    • , Guancong Ma
    •  & C. T. Chan

  • Research Highlights |

    • Bart Verberck

  • News & Views |

    Transformation optics is an invaluable tool for designing metamaterials. The same idea, it is now shown, could also prove to be a boon for nanoplasmonics.

    • R. C. McPhedran

  • Research Highlights |

    • Bart Verberck

  • News & Views |

    A planar composite material images ultraviolet light like a lens, by unwinding its phase. The concept could aid high-resolution nanolithography.

    • Rupert F. Oulton
    •  & John B. Pendry

  • Article |

    Photonic crystals efficiently control wave propagation on a wavelength scale, but this means they can become very large when long wavelengths are involved. Metamaterials made of resonant unit cells can confine and guide waves even at scales far below their wavelength.

    • Fabrice Lemoult
    • , Nadège Kaina
    •  & Geoffroy Lerosey

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