Volume 18 Issue 7, July 2019

Volume 18 Issue 7

Excitons between the sheets

Ultrafast transition between exciton phases in van der Waals heterostructures.

See Merkl et al. and Cundiff News & Views.

IMAGE: Image by Brad Baxley, Part to Whole. COVER DESIGN: David Shand.

Editorial

Comment

  • Comment |

    Oxides of non-magnetic cations exhibit elusive signs of weak temperature-independent ferromagnetism. The effect is associated with surface defects, but it defies conventional explanation. Possible hypotheses are a spin-split defect impurity band, or giant orbital paramagnetism related to zero-point vacuum fluctuations.

    • J. M. D. Coey

News & Views

  • News & Views |

    The chiral magnetic exchange interaction, or Dzyaloshinskii–Moriya interaction, is found to propagate through dozens of atomic layers and also to be present in inhomogeneous amorphous alloys. These discoveries extend the parameter space available for realizing magnetic structures with chiral character.

    • Bartel Van Waeyenberge
  • News & Views |

    Measuring the 1s–2p splitting of direct and indirect excitons in van der Waals heterostructures allows their binding energy and dynamics to be determined.

    • Steven T. Cundiff
  • News & Views |

    A magnetic-field-dependent spectroscopy study on single perovskite nanocrystals reveals the spectral signatures of an exciton dark state below the bright triplet states.

    • Andries Meijerink
    •  & Freddy T. Rabouw
  • News & Views |

    An intermediate affinity state of integrin αIIBβ3 has been identified to be a key player in platelet mechanosignalling.

    • X. Frank Zhang
    •  & Xuanhong Cheng
  • News & Views |

    Controlled Pt loading on TiO2 nanoparticles enables single-site catalysts. With this, the coordination environment and catalytic activity can be obtained, allowing extraction of structure-function information.

    • E. Charles H. Sykes
  • News & Views |

    A comprehensive chemical space of potential inorganic ternary metal nitrides has been explored by computational methods as a guideline for their experimental synthesis and discovery.

    • Ralf Riedel
    •  & Zhaoju Yu

Review Articles

  • Review Article |

    This Review discusses the origins of localized plasmon resonances in few-nanometre or sub-nanometre gaps between metal nanoparticles and metal films, as well recent experimental observations and potential future directions.

    • Jeremy J. Baumberg
    • , Javier Aizpurua
    • , Maiken H. Mikkelsen
    •  & David R. Smith

Letters

  • Letter |

    A composition gradient is found to provide the necessary structural inversion asymmetry for a bulk Dzyaloshinskii–Moriya interaction to manifest itself.

    • Duck-Ho Kim
    • , Mitsutaka Haruta
    • , Hye-Won Ko
    • , Gyungchoon Go
    • , Hyeon-Jong Park
    • , Tomoe Nishimura
    • , Dae-Yun Kim
    • , Takaya Okuno
    • , Yuushou Hirata
    • , Yasuhiro Futakawa
    • , Hiroki Yoshikawa
    • , Wooseung Ham
    • , Sanghoon Kim
    • , Hiroki Kurata
    • , Arata Tsukamoto
    • , Yoichi Shiota
    • , Takahiro Moriyama
    • , Sug-Bong Choe
    • , Kyung-Jin Lee
    •  & Teruo Ono
  • Letter |

    Femtosecond pump–probe measurements of Coulomb correlations in WS2/WSe2 heterostructures reveal the interlayer exciton binding energy, determined from the 1s–2p resonance, as well as the dynamics of the conversion of intra- to interlayer excitons.

    • P. Merkl
    • , F. Mooshammer
    • , P. Steinleitner
    • , A. Girnghuber
    • , K.-Q. Lin
    • , P. Nagler
    • , J. Holler
    • , C. Schüller
    • , J. M. Lupton
    • , T. Korn
    • , S. Ovesen
    • , S. Brem
    • , E. Malic
    •  & R. Huber
  • Letter |

    Interfacial water structures in electric double layers under bias potentials can impact the electrochemical performance of electrodes. Two structural transitions of interfacial water at electrified Au single-crystal electrode surfaces have now been identified.

    • Chao-Yu Li
    • , Jia-Bo Le
    • , Yao-Hui Wang
    • , Shu Chen
    • , Zhi-Lin Yang
    • , Jian-Feng Li
    • , Jun Cheng
    •  & Zhong-Qun Tian

Articles

  • Article |

    An antisymmetric and chiral long range interlayer magnetic exchange interaction is measured, with implications for spintronics and chiral magnetic devices.

    • Dong-Soo Han
    • , Kyujoon Lee
    • , Jan-Philipp Hanke
    • , Yuriy Mokrousov
    • , Kyoung-Whan Kim
    • , Woosuk Yoo
    • , Youri L. W. van Hees
    • , Tae-Wan Kim
    • , Reinoud Lavrijsen
    • , Chun-Yeol You
    • , Henk J. M. Swagten
    • , Myung-Hwa Jung
    •  & Mathias Kläui
  • Article |

    Extreme electronic anisotropy is revealed in the high-temperature superconductor FeSe through tour de force experiments on detwinned crystals.

    • Tong Chen
    • , Youzhe Chen
    • , Andreas Kreisel
    • , Xingye Lu
    • , Astrid Schneidewind
    • , Yiming Qiu
    • , J. T. Park
    • , Toby G. Perring
    • , J Ross Stewart
    • , Huibo Cao
    • , Rui Zhang
    • , Yu Li
    • , Yan Rong
    • , Yuan Wei
    • , Brian M. Andersen
    • , P. J. Hirschfeld
    • , Collin Broholm
    •  & Pengcheng Dai
  • Article |

    Magneto-optical spectroscopy shows that the dark exciton state in single formamidinium lead bromide perovskite nanocrystals is located below the bright exciton triplet. Slow bright-to-dark relaxation explains the intense brightness of the nanoparticles.

    • Philippe Tamarat
    • , Maryna I. Bodnarchuk
    • , Jean-Baptiste Trebbia
    • , Rolf Erni
    • , Maksym V. Kovalenko
    • , Jacky Even
    •  & Brahim Lounis
  • Article |

    Material depletion and accumulation at the crystallization front of organic semiconductors films induce the formation of large-area regular patterns, with a periodicity relevant to optoelectronic applications in the visible and near-infrared range.

    • John S. Bangsund
    • , Thomas R. Fielitz
    • , Trevor J. Steiner
    • , Kaicheng Shi
    • , Jack R. Van Sambeek
    • , Catherine P. Clark
    •  & Russell J. Holmes
  • Article |

    High-throughput computation is especially useful for materials screening where synthesis is challenging. Here, it is used to construct a stability map of ternary nitrides, allowing discovery of stable compounds and providing insight into principles that govern nitride stability.

    • Wenhao Sun
    • , Christopher J. Bartel
    • , Elisabetta Arca
    • , Sage R. Bauers
    • , Bethany Matthews
    • , Bernardo Orvañanos
    • , Bor-Rong Chen
    • , Michael F. Toney
    • , Laura T. Schelhas
    • , William Tumas
    • , Janet Tate
    • , Andriy Zakutayev
    • , Stephan Lany
    • , Aaron M. Holder
    •  & Gerbrand Ceder
  • Article |

    Porous molecular crystals are easy to fabricate but thought to have limited stability as they are bound by non-covalent interactions. Here, a porous crystal composed of C60 and phthalocyanine is demonstrated with stability to heat, acid, base and high pressures.

    • C. Grazia Bezzu
    • , Luke A. Burt
    • , Charlie J. McMonagle
    • , Stephen A. Moggach
    • , Benson M. Kariuki
    • , David R. Allan
    • , Mark Warren
    •  & Neil B. McKeown
  • Article |

    Oxide-supported isolated Pt-group metal atoms as catalytic active sites are of interest because of their unique reactivity. Isolated Pt species are now shown to adopt a range of local coordination environments and oxidation states in response to environmental conditions.

    • Leo DeRita
    • , Joaquin Resasco
    • , Sheng Dai
    • , Alexey Boubnov
    • , Ho Viet Thang
    • , Adam S. Hoffman
    • , Insoo Ro
    • , George W. Graham
    • , Simon R. Bare
    • , Gianfranco Pacchioni
    • , Xiaoqing Pan
    •  & Phillip Christopher
  • Article |

    Proton ceramic electrolysers can produce hydrogen directly from steam, but their development has suffered from limited electrical efficiency. A fully operational and stable BaZrO3-based tubular electrolyser with high hydrogen production rate is now reported.

    • Einar Vøllestad
    • , Ragnar Strandbakke
    • , Mateusz Tarach
    • , David Catalán-Martínez
    • , Marie-Laure Fontaine
    • , Dustin Beeaff
    • , Daniel R. Clark
    • , Jose M. Serra
    •  & Truls Norby

Amendments & Corrections