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Volume 18 Issue 4, April 2019

Volume 18 Issue 4

A polar supercrystal

Upon ultrafast irradiation, a (PbTiO3)/(SrTiO3) superlattice transforms into a complex supercrystal that contains periodicities of up to 30 nm in size and is stable in ambient. Creation and destruction, by heating, of the supercrystal is reversible.

See Stoica et al. and Gregg News & Views.

Image: Xiaoxing Cheng, Penn State. Cover Design: David Shand

Editorial

  • Editorial |

    The redefinition of SI units removes materiality from science’s weights and measures. There’s logic to the decision, but it reminds us what we still don’t know about nature’s scales.

News & Views

  • News & Views |

    Strong spin–electric coupling related to modulation of magnetic coupling has now been observed in polar spin chains. This is a first step towards switching quantum bit interactions by localized electric fields.

    • Joris van Slageren
  • News & Views |

    Potassium–air batteries, which suffer from oxygen cathode and potassium metal anode degradation, can be cycled thousands of times when an organic anode replaces the metal.

    • Yann K. Petit
    • Stefan A. Freunberger
  • News & Views |

    A two-step method has been developed for the accelerated and efficient generation of human kidney organoids using in vitro and in ovo culture in a three-dimensional environment.

    • Susana M. Chuva de Sousa Lopes
  • News & Views |

    Irradiating a PbTiO3/SrTiO3 superlattice with ultrafast UV light pulses modifies elastic and electrostatic interactions, resulting in the formation of a stable complex 3D supercrystal.

    • J. M. Gregg
  • News & Views |

    Impulsive Raman spectroscopy reveals how atoms are pushed into action by light absorption. The surprising sensitivity of this behaviour to the polaronic character of 2D perovskites opens up new avenues for tailored light–matter interactions.

    • Christoph Schnedermann
    • Akshay Rao
    • Philipp Kukura

Review Articles

  • Review Article |

    Memristive devices show great potential as artificial synapses and neurons, yet brain-inspired computing can be realized only by integrating a large number of these devices into reliable arrays. This Review discusses the challenges in the integration and use in computation of large-scale memristive neural networks.

    • Qiangfei Xia
    • J. Joshua Yang

Letters

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