Volume 18 Issue 2, February 2019

Volume 18 Issue 2

The power of two

An optimized design for broad-area surface-emitting photonics-crystal laser leads to high brightness of over 300 MW cm−2 sr−1 and an output power of 10 W under pulsed excitation.

See Yoshida et al.

Image: Susumu Noda and Masahiro Yoshida, Kyoto University. Cover Design: David Shand

Editorial

News & Views

  • News & Views |

    By combining metal ions, organic linkers and polymers, ordered frameworks with controlled crystallite size can form. When fabricated into membranes, they combine superlative CO2/N2 separation properties with good hydrolytic stability.

    • Joshua D. Moon
    •  & Benny D. Freeman
  • News & Views |

    A single dopant molecule can exchange more than one charge with the hosting polymer semiconductor, doubling the maximum doping efficiency achievable.

    • Björn Lüssem
  • News & Views |

    A vaccine platform developed from a synthetic polymeric glyco-adjuvant and reversibly conjugated to an antigen was shown to target dendritic cells leading to cellular and humoral immune response against malaria.

    • Yvette van Kooyk
  • News & Views |

    A photonic crystal design, consisting of two separated lattices arranged in a specific way, forms the base of high-brightness semiconductor lasers, with a very narrow beam divergence angle.

    • L. Kuipers
  • News & Views |

    Higher-order topological acoustic metamaterials on kagome lattices, which host topologically protected corner states, can confine sound at corners. This may lead to applications of acoustic metamaterials in local acoustic field enhancement, trapping and manipulating of particles, and acoustic sensing and probing.

    • Zhengyou Liu
  • News & Views |

    Despite an enormous number of nanopores that could, in principle, be formed in atomically thin materials, advanced modelling reveals that in typical experiments rather limited ensembles of most likely nanopores should be observed.

    • Petr Král

Letters

  • Letter |

    A surface annealing method is used to access an insulating phase of Bi2Sr2CaCu2O8+x and unidirectional charge order is observed.

    • He Zhao
    • , Zheng Ren
    • , Bryan Rachmilowitz
    • , John Schneeloch
    • , Ruidan Zhong
    • , Genda Gu
    • , Ziqiang Wang
    •  & Ilija Zeljkovic
  • Letter |

    A second-order topological insulator in an acoustical metamaterial with a breathing kagome lattice, supporting one-dimensional edge states and zero-dimensional corner states is demonstrated.

    • Haoran Xue
    • , Yahui Yang
    • , Fei Gao
    • , Yidong Chong
    •  & Baile Zhang

Articles

  • Article |

    Nanopores in 2D materials have various possible lattice isomers, making relevant quantitative analysis difficult. An isomer-cataloguing framework is developed to address this problem, demonstrating remarkable agreement between simulated and experimental data.

    • Ananth Govind Rajan
    • , Kevin S. Silmore
    • , Jacob Swett
    • , Alex W. Robertson
    • , Jamie H. Warner
    • , Daniel Blankschtein
    •  & Michael S. Strano
  • Article |

    Thermal management can improve device function, but the role of dislocations is poorly understood. Here, thermoreflectance measurements show orientated dislocations in InN cause a thermal anisotropy ratio of 10, which is not predicted by standard models.

    • Bo Sun
    • , Georg Haunschild
    • , Carlos Polanco
    • , James (Zi-Jian) Ju
    • , Lucas Lindsay
    • , Gregor Koblmüller
    •  & Yee Kan Koh
  • Article |

    A monomer molecular dopant with high electron affinity is shown to accept up to two electrons from conjugated polymers with low ionization efficiency and then generate free charge carriers with an efficiency of up to 170%.

    • David Kiefer
    • , Renee Kroon
    • , Anna I. Hofmann
    • , Hengda Sun
    • , Xianjie Liu
    • , Alexander Giovannitti
    • , Dominik Stegerer
    • , Alexander Cano
    • , Jonna Hynynen
    • , Liyang Yu
    • , Yadong Zhang
    • , Dingqi Nai
    • , Thomas F. Harrelson
    • , Michael Sommer
    • , Adam J. Moulé
    • , Martijn Kemerink
    • , Seth R. Marder
    • , Iain McCulloch
    • , Mats Fahlman
    • , Simone Fabiano
    •  & Christian Müller
  • Article |

    Black phosphorus is being considered for energy storage but its rate and cycling capabilities are limited by intrinsic (de-)alloying. Molecular-level surface redox sites on oxidized black phosphorus can now be coupled with graphene via strong interlayer bonding.

    • Puritut Nakhanivej
    • , Xu Yu
    • , Sul Ki Park
    • , Soo Kim
    • , Jin-Yong Hong
    • , Hae Jin Kim
    • , Wonki Lee
    • , Jun Yeon Hwang
    • , Ji Eun Yang
    • , Chris Wolverton
    • , Jing Kong
    • , Manish Chhowalla
    •  & Ho Seok Park
  • Article |

    Controlling crystallite size can lead to improved applications. Here, this is achieved by a combination of metal ions, organic linkers, and polymers; the resultant membrane displays promising CO2/N2 separation properties and hydrolytic stability.

    • Zhihua Qiao
    • , Song Zhao
    • , Menglong Sheng
    • , Jixiao Wang
    • , Shichang Wang
    • , Zhi Wang
    • , Chongli Zhong
    •  & Michael D. Guiver
  • Article |

    A vaccine platform has been developed from a polymeric glyco-adjuvant conjugated to an antigen, and is now shown to target dendritic cells via mannose-binding receptors and generate potent cellular and humoral immune response against malaria.

    • D. Scott Wilson
    • , Sachiko Hirosue
    • , Michal M. Raczy
    • , Leonardo Bonilla-Ramirez
    • , Laura Jeanbart
    • , Ruyi Wang
    • , Marcin Kwissa
    • , Jean-Francois Franetich
    • , Maria A. S. Broggi
    • , Giacomo Diaceri
    • , Xavier Quaglia-Thermes
    • , Dominique Mazier
    • , Melody A. Swartz
    •  & Jeffrey A. Hubbell

Amendments & Corrections