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Volume 18 Issue 5, May 2019

Volume 18 Issue 5

A topological shift

A large photoresponse is observed in type-I and type-II Weyl semimetals, and attributed to the shift current associated with a Berry connection.

See Ma et al., Osterhoudt et al. and Weng News & Views

Image: Kenneth Burch and Mason Gray, Boston College; Dong Sun and Junchao Ma, Peking University. Cover Design: David Shand.




  • Comment |

    Rapid progress in machine learning is enabling opportunities for improved clinical decision support. Importantly, however, developing, validating and implementing machine learning models for healthcare entail some particular considerations to increase the chances of eventually improving patient care.

    • Po-Hsuan Cameron Chen
    • , Yun Liu
    •  & Lily Peng
  • Comment |

    This Comment describes some of the common pitfalls encountered in deriving and validating predictive statistical models from high-dimensional data. It offers a fresh perspective on some key statistical issues, providing some guidelines to avoid pitfalls, and to help unfamiliar readers better assess the reliability and significance of their results.

    • Andrew E. Teschendorff

News & Views

  • News & Views |

    By measuring the photocurrent from illuminated Weyl semimetals, an optical signature of topological properties arising from Weyl fermions has been revealed, highlighting nonlinear optical effects and applications of Weyl semimetals.

    • Hongming Weng
  • News & Views |

    Neural probes that mimic the subcellular structural features and mechanical properties of neurons assimilate across several structures of the brain to provide chronically stable neural recordings in a mouse model.

    • Jeffrey R. Capadona
    • , Andrew J. Shoffstall
    •  & Joseph J. Pancrazio
  • News & Views |

    Organic donor–acceptor heterojunctions can show efficient electroluminescence and at the same time generate charges under photovoltaic operation.

    • Wolfgang Brütting




  • Article |

    A large photoresponse is observed in the type-II Weyl semimetal TaIrTe4, and attributed to the diverging Berry curvature of the Weyl nodes.

    • Junchao Ma
    • , Qiangqiang Gu
    •  & Dong Sun
  • Article |

    Sensing hydrogen by the change in plasmonic response upon metal hydride formation is safe, but trace gas poisoning and low sensitivity can occur. Here, a PdAu alloy/polymer sensor is poison resistant and can sense 3 ppm H2 with a response time of 1 s.

    • Ferry A. A. Nugroho
    • , Iwan Darmadi
    •  & Christoph Langhammer
  • Article |

    Although anionic redox in Li- and Na-rich transition metal oxides can enhance energy density of rechargeable batteries, anionic capacity is partly irreversible in discharge. A unified picture to clarify this irreversibility and to improve cycling performance is proposed.

    • Mouna Ben Yahia
    • , Jean Vergnet
    •  & Marie-Liesse Doublet
  • Article |

    The structural foundation of self-assembled peptide materials is typically the β-sheet. Here the authors describe peptides made of three natural amino acids that self-assemble into helical-like superstructures with enhanced mechanical rigidity.

    • Santu Bera
    • , Sudipta Mondal
    •  & Ehud Gazit
  • Article |

    Neural probes mimicking the size and mechanical properties of neurons interpenetrate the brain tissue, allowing stable single-unit recordings from implantation up to at least three months, and acting as scaffolds for the migration of new-born neurons.

    • Xiao Yang
    • , Tao Zhou
    •  & Charles M. Lieber

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