Volume 19 Issue 6, June 2020

Volume 19 Issue 6

Dual topological insulator

Bi2TeI is identified as a dual topological insulator. It is a weak topological insulator with metallic states at the (010) surfaces and a topological crystalline insulator at the (001) surfaces.

See Avraham

IMAGE: Avraham Eligal and Yogev Zorea COVER DESIGN: Alex Wing.

Editorial

  • Editorial |

    Interlayer excitons trapped within van der Waals heterostructures hold great promise for the design of quantum materials, but investigations into their fundamental properties are crucial for future developments in the field.

Obituary

  • Obituary |

    Father of modern ferroelectrics.

    • Gustau Catalan
    • , Matthew Dawber
    • , Marty Gregg
    • , Finlay Morrison
    • , Ramamoorthy Ramesh
    •  & Pavlo Zubko

News & Views

  • News & Views |

    Two studies investigate the behaviour of localized interlayer excitons in van der Waals heterostructures, offering insights into their dipolar interactions and the effect of moiré trapping potentials for the design of quantum optical applications based on 2D materials.

    • Alexander Tartakovskii
  • News & Views |

    Large-scale atomically thin metals can be stabilized through confinement epitaxy at graphene/SiC interface, which exhibit a gradient bonding type and are air stable, providing a compelling platform for quantum and optoelectronic technologies.

    • Claire Berger
    •  & Walt A. de Heer
  • News & Views |

    A high-speed, high-gain enhancement-mode ion-gated transistor shows promise for low-power chronically implanted bioelectronic systems.

    • Scott Keene
    •  & Yoeri van de Burgt
  • News & Views |

    Two independent studies describe the discovery of structurally pure cubic ice Ic made from either ice XVII or a high-pressure hydrogen hydrate.

    • Christoph G. Salzmann
    •  & Benjamin J. Murray
  • News & Views |

    While integrin-based adhesions are thought to underlie many aspects of cell response to localized tension, another matrix receptor, syndecan-4, has now been shown to act as a mechanosensor, which triggers cell-wide integrin activation and adhesion reinforcement.

    • Christophe Guilluy
    •  & Monika E. Dolega

Review Articles

  • Review Article |

    This Review provides an overview of the advances in materials and device design that are enabling the realization of implantable electronic interfaces for long-term, multiplexed recording and stimulation of the brain and nervous system.

    • Enming Song
    • , Jinghua Li
    • , Sang Min Won
    • , Wubin Bai
    •  & John A. Rogers

Letters

  • Letter |

    Flexoelectricity is the ability of materials to generate electricity upon bending. Here it is demonstrated that adding light to mechanical oscillation enhances effective flexoelectric coefficients by orders of magnitude, with the halide perovskites showing the largest coefficients.

    • Longlong Shu
    • , Shanming Ke
    • , Linfeng Fei
    • , Wenbin Huang
    • , Zhiguo Wang
    • , Jinhui Gong
    • , Xiaoning Jiang
    • , Li Wang
    • , Fei Li
    • , Shuijin Lei
    • , Zhenggang Rao
    • , Yangbo Zhou
    • , Ren-Kui Zheng
    • , Xi Yao
    • , Yu Wang
    • , Massimiliano Stengel
    •  & Gustau Catalan

Articles

  • Article |

    Bi2TeI is identified as a dual topological insulator. It is a weak topological insulator with metallic states at the (010) surfaces and a topological crystalline insulator at the (001) surfaces.

    • Nurit Avraham
    • , Abhay Kumar Nayak
    • , Aviram Steinbok
    • , Andrew Norris
    • , Huixia Fu
    • , Yan Sun
    • , Yanpeng Qi
    • , Lin Pan
    • , Anna Isaeva
    • , Alexander Zeugner
    • , Claudia Felser
    • , Binghai Yan
    •  & Haim Beidenkopf
  • Article |

    Interlayer exciton dynamics in a van der Waals heterostructure is found to be modulated by the twist angle between the atomically thin layers, elucidating the effect of moiré potentials on exciton motion and providing guidelines to design quantum photonics devices based on 2D materials.

    • Long Yuan
    • , Biyuan Zheng
    • , Jens Kunstmann
    • , Thomas Brumme
    • , Agnieszka Beata Kuc
    • , Chao Ma
    • , Shibin Deng
    • , Daria Blach
    • , Anlian Pan
    •  & Libai Huang
  • Article |

    The optical properties of two species of localized interlayer excitons in a van der Waals heterostructure are shown to depend on their spin–valley–layer configuration, enabling the identification of the moiré atomic registry and offering insights for engineering quantum states in two-dimensional materials.

    • Mauro Brotons-Gisbert
    • , Hyeonjun Baek
    • , Alejandro Molina-Sánchez
    • , Aidan Campbell
    • , Eleanor Scerri
    • , Daniel White
    • , Kenji Watanabe
    • , Takashi Taniguchi
    • , Cristian Bonato
    •  & Brian D. Gerardot
  • Article |

    Single-crystal 2D metals are stabilized at the interface between epitaxial graphene and silicon carbide, with strong internal gradients in bonding character. The confined 2D metals demonstrate compelling superconducting properties.

    • Natalie Briggs
    • , Brian Bersch
    • , Yuanxi Wang
    • , Jue Jiang
    • , Roland J. Koch
    • , Nadire Nayir
    • , Ke Wang
    • , Marek Kolmer
    • , Wonhee Ko
    • , Ana De La Fuente Duran
    • , Shruti Subramanian
    • , Chengye Dong
    • , Jeffrey Shallenberger
    • , Mingming Fu
    • , Qiang Zou
    • , Ya-Wen Chuang
    • , Zheng Gai
    • , An-Ping Li
    • , Aaron Bostwick
    • , Chris Jozwiak
    • , Cui-Zu Chang
    • , Eli Rotenberg
    • , Jun Zhu
    • , Adri C. T. van Duin
    • , Vincent Crespi
    •  & Joshua A. Robinson
  • Article |

    The application of metal fluorides as cathodes for lithium ion batteries has been hindered by inadequate understanding of their electrochemical capabilities. Reversible conversion reaction in iron fluoride nanocrystals is shown to be due to topotactic cation diffusion and nucleation of metallic particles.

    • Albert W. Xiao
    • , Hyeon Jeong Lee
    • , Isaac Capone
    • , Alex Robertson
    • , Tae-Ung Wi
    • , Jack Fawdon
    • , Samuel Wheeler
    • , Hyun-Wook Lee
    • , Nicole Grobert
    •  & Mauro Pasta
  • Article |

    Unlike dynamic control of electrical conductivity, tuning thermal conductivity by means of electric potential is challenging. Electrochemically induced phase transition control of oxygen and proton concentration in a SrCoOx oxide provides a way to tune bi-directionally thermal conductivity.

    • Qiyang Lu
    • , Samuel Huberman
    • , Hantao Zhang
    • , Qichen Song
    • , Jiayue Wang
    • , Gulin Vardar
    • , Adrian Hunt
    • , Iradwikanari Waluyo
    • , Gang Chen
    •  & Bilge Yildiz
  • Article |

    A mechanism of cell response to localized tension shows that syndecan-4 synergizes with EGFR to elicit a mechanosignalling cascade that leads to adaptive cell stiffening through PI3K/kindlin-2 mediated integrin activation.

    • Antonios Chronopoulos
    • , Stephen D. Thorpe
    • , Ernesto Cortes
    • , Dariusz Lachowski
    • , Alistair J. Rice
    • , Vasyl V. Mykuliak
    • , Tomasz Róg
    • , David A. Lee
    • , Vesa P. Hytönen
    •  & Armando E. del Río Hernández
  • Article |

    Internal ion-gated organic electrochemical transistors operating in enhancement mode are shown to record electrophysiological signals in vivo, with a speed and sensitivity that enable the detection of action potentials from individual neurons.

    • Claudia Cea
    • , George D. Spyropoulos
    • , Patricia Jastrzebska-Perfect
    • , José J. Ferrero
    • , Jennifer N. Gelinas
    •  & Dion Khodagholy

Why it Matters

  • Why it Matters |

    Litao Sun, Yongming Tang and Wei Zuo reflect on their experience of nationwide distance learning in China’s universities during the COVID-19 outbreak.

    • Litao Sun
    • , Yongming Tang
    •  & Wei Zuo