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Volume 12 Issue 3, March 2016

Simulated pipe flow is interpreted using an ecological model in which predatory zonal flow preys on turbulence, and laminar flows emulate nutrients – establishing a link between turbulence and the directed percolation universality class.Letter p245; News & Views p204IMAGE: HONG-YAN SHIH, TSUNG-LIN HSIEH, NIGEL GOLDENFELD, NICHOLAS GUTTENBERGCOVER DESIGN: ALLEN BEATTIE

Editorial

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  • Physicists have finally detected gravitational waves, in a triumph of ingenuity and perseverance. And now we need to explain them to the general public.

    Editorial
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Commentary

  • For a problem as complex as turbulence, combining universal concepts from statistical physics with ideas from fluid mechanics has proven indispensable. Three decades since this link was formed, it is still providing food for new thought.

    • Yves Pomeau
    Commentary
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Thesis

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Research Highlights

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News & Views

  • Intense light pulses irradiating a sample of K3C60 result in dramatic changes of its high-frequency (terahertz) conductivity. Could these be signatures of fleeting superconductivity at 100 K and beyond?

    • Jure Demsar
    News & Views
  • In the transition from laminar to turbulent pipe flow, puffs of turbulence form, split and decay. The phenomenology and lifetime of these turbulent puffs exhibit population dynamics that also drive predator–prey ecosystems on the edge of extinction.

    • Johannes Knebel
    • Markus F. Weber
    • Erwin Frey

    Focus:

    News & Views
  • In some two-dimensional materials, there's a puzzling intermediate metallic phase between superconducting and insulating states. Experiments on ultraclean crystalline samples suggest this metallic phase could be bosonic.

    • Philip W. Phillips
    News & Views
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Letter

  • Topologically non-trivial states usually emerge from systems with strong spin–orbit coupling, but evidence for such states in the Kondo insulator samarium hexaboride suggests that they can also be driven by strong electron correlations.

    • Yasuyuki Nakajima
    • Paul Syers
    • Johnpierre Paglione
    Letter
  • The detection of a single photon heralds the projection of two remote spins onto a maximally entangled state. This has been demonstrated for quantum-dot hole spins, featuring a fast generation rate that could enable quantum technology applications.

    • Aymeric Delteil
    • Zhe Sun
    • Ataç Imamoğlu
    Letter
  • A neutron scattering study of the quantum magnet BiCu2PO6 demonstrates a phenomenon known as energy-level repulsion, which occurs between a long-lived quasiparticle state and a many-particle continuum.

    • K. W. Plumb
    • Kyusung Hwang
    • Young-June Kim
    Letter
  • When laser light is focused onto graphene devices in a magnetic field a long-range photo-Nernst effect causes photocurrents to be generated along the free edges.

    • Helin Cao
    • Grant Aivazian
    • Xiaodong Xu
    Letter
  • Experiments and simulations of the transition to turbulence in fluid flow through a quasi-2D channel reveal critical exponents consistent with directed percolation — long conjectured to be the universality class associated with the transition.

    • Masaki Sano
    • Keiichi Tamai

    Focus:

    Letter
  • Fluctuations in the profile of the ocean floor can lead to large variations in tsunami wave height. A theory linking this behaviour to the branched flow characteristics of electron waves through semiconductors may provide a framework for prediction.

    • Henri Degueldre
    • Jakob J. Metzger
    • Ragnar Fleischmann
    Letter
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Article

  • A series of transport experiments on lanthanum antimonide reveal a plateau in its resistivity and an extremely large magnetoresistance that are consistent with topologically protected electronic states.

    • F. F. Tafti
    • Q. D. Gibson
    • R. J. Cava
    Article
  • A study of robots jumping on granular media reveals that performance depends on an added-mass effect born of grains solidifying on impact. Techniques that are optimized for launching off hard surfaces are shown to be compromised by the effect.

    • Jeffrey Aguilar
    • Daniel I. Goldman
    Article
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Measure for Measure

  • François Piquemal tells the story of the ampere, which bridges mechanical and electromagnetic units.

    • François Piquemal
    Measure for Measure
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