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Volume 16 Issue 6, June 2020

Volume 16 Issue 6

Turbulence in starfish egg cells

Activity in certain living systems can lead to swirling flows akin to turbulence. Here, the authors connect the dynamics of topological defects in starfish oocyte membranes to vortex dynamics in 2D Bose–Einstein condensates.

See Tan et al.

Image: Tzer Han Tan, Massachusetts Institute of Technology. Cover Design: Allen Beattie

Editorial

  • Editorial |

    The contribution of partners and families to scientists’ work is often overlooked. It should be acknowledged and supported more.

Comment

  • Comment |

    Automated learning from data by means of deep neural networks is finding use in an ever-increasing number of applications, yet key theoretical questions about how it works remain unanswered. A physics-based approach may help to bridge this gap.

    • Lenka Zdeborová

Thesis

Perspectives

  • Perspective |

    This Perspective argues that an approach called extreme value theory is appropriate for understanding the so-called tail risk of epidemic outbreaks, in particular by demonstrating that the distribution of fatalities due to epidemic outbreaks over the past 2500 years is fat-tailed and dominated by extreme events.

    • Pasquale Cirillo
    • Nassim Nicholas Taleb

Letters

  • Letter |

    In one-dimensional quantum magnets, complex bound states of magnetic excitations known as Bethe strings have long been predicted. Now, a detailed neutron scattering study of SrCo2V2O8 reveals their magnetic-field-dependent dispersion relation.

    • Anup Kumar Bera
    • Jianda Wu
    • Bella Lake
  • Letter |

    Moiré engineering has rapidly gained currency as a means to manipulate electronic states of matter in van der Waals heterostructures. Now, the feat is achieved in epitaxially grown oxide heterostructures, thus opening up fresh opportunities for strongly correlated electronic systems.

    • Xinzhong Chen
    • Xiaodong Fan
    • Changgan Zeng
  • Letter |

    What happens to topological materials when their electrons are strongly interacting is an open question. Shao and others demonstrate that ZrSiSe is a material that can address this as it has a topological band structure and non-trivial correlations.

    • Yinming Shao
    • A. N. Rudenko
    • D. N. Basov
  • Letter |

    A passive, heralded and high-fidelity quantum memory network node has been realized, which connects simultaneously to two quantum channels provided by orthogonally aligned optical fibre cavities coupled with a single atom.

    • Manuel Brekenfeld
    • Dominik Niemietz
    • Gerhard Rempe
  • Letter |

    Two-dimensional density patterns with two-, four- and six-fold symmetries emerge in homogeneous Bose–Einstein condensates when the atomic interactions are modulated at multiple frequencies causing the coherent mixing of excitations.

    • Zhendong Zhang
    • Kai-Xuan Yao
    • Cheng Chin
  • Letter |

    Activity in certain living systems can lead to swirling flows akin to turbulence. Here, the authors connect the dynamics of topological defects in starfish oocyte membranes to vortex dynamics in 2D Bose–Einstein condensates.

    • Tzer Han Tan
    • Jinghui Liu
    • Nikta Fakhri

Articles

  • Article |

    Majorana bound states at the end of nanowires may be used for quantum computation if they can be coupled sufficiently strongly. Here, the Copenhagen lab show strong and tunable coupling, a step along the road towards devices.

    • David M. T. van Zanten
    • Deividas Sabonis
    • Charles M. Marcus
  • Article |

    A kind of quantum metasurface made of an atom array is proposed, providing the possibility to control both spatiotemporal and quantum properties of transmitted and reflected light.

    • R. Bekenstein
    • I. Pikovski
    • M. D. Lukin
  • Article |

    Determining the properties that emerge from the equations that govern turbulent flow is a fundamental challenge in non-equilibrium physics. A hydrodynamic theory for two-dimensional active nematic fluids at vanishing Reynolds number is now put forward, revealing a universal scaling behaviour for this class of systems.

    • Ricard Alert
    • Jean-François Joanny
    • Jaume Casademunt

Amendments & Corrections

Measure for Measure

  • Measure for Measure |

    As a unit for enzyme activity, the katal is enigmatic but struggles to find widespread acceptance. Soumitra Athavale tells its story.

    • Soumitra V. Athavale

Search

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