Volume 13 Issue 11, November 2018

Volume 13 Issue 11

Probing intersubbands in 2D materials

The device operation of quantum-well infrared photodetectors and quantum-cascade lasers rely on intersubband transitions — that is, transitions that occur between quantized states in quantum wells that are typically fabricated from different III–V semiconductor alloys. The combination of materials in these structures is limited by strict lattice-matching conditions, which may deteriorate the device performance. Owing to their design versatility, van der Waals quantum wells naturally formed in 2D materials heterostructures are not impaired by these restrictions. However, until now, intersubband transitions in van der Waals quantum wells have not been observed experimentally. Now, Schmidt et al. employ near-field local probing to spectrally resolve intersubband transitions in layered transition metal dichalcogenides (TMDs) providing the opportunity to study these phenomena in van der Waals quantum wells for future applications. The cover is the artist’s depiction of an optically excited van der Waals layered structure formed by terraced TMDs.

See Koppens et al.

Image: Fabien Vialla. Cover Design: Sam Whitham

Editorial

Comment

Obituary

Research Highlights

News & Views

  • News & Views |

    Chemical oscillations emerge during the chemically fuelled self-assembly of a perylene diimide derivative as a result of simple feedback mechanisms.

    • Job Boekhoven
  • News & Views |

    Particle nanofeatures activate the inflammasome and influence immunity.

    • Brandon M. Johnson
    • , Robert D. Junkins
    •  & Jenny P.-Y. Ting
  • News & Views |

    Magneto-photoluminescence experiments reveal the role of dark excitons in the formation of biexcitons and charged biexcitons in tungsten diselenide monolayers.

    • Cedric Robert
  • News & Views |

    Engineered nanomaterials are often highly reactive and readily transform to new species. New modelling capabilities incorporate these transformations into estimates of environmental exposure concentrations and associated risks more accurately.

    • Gregory V. Lowry

Perspectives

Review Articles

Letters

Articles

  • Article |

    Electrode–domain wall junctions in ferroelectric ErMnO3 act as nanoscale diodes.

    • Jakob Schaab
    • , Sandra H. Skjærvø
    • , Stephan Krohns
    • , Xiaoyu Dai
    • , Megan E. Holtz
    • , Andrés Cano
    • , Martin Lilienblum
    • , Zewu Yan
    • , Edith Bourret
    • , David A. Muller
    • , Manfred Fiebig
    • , Sverre M. Selbach
    •  & Dennis Meier
  • Article |

    Experimental observation of intersubband transitions in van der Waals quantum wells is enabled by high spatial resolution imaging through near-field optical microscopy.

    • Peter Schmidt
    • , Fabien Vialla
    • , Simone Latini
    • , Mathieu Massicotte
    • , Klaas-Jan Tielrooij
    • , Stefan Mastel
    • , Gabriele Navickaite
    • , Mark Danovich
    • , David A. Ruiz-Tijerina
    • , Celal Yelgel
    • , Vladimir Fal’ko
    • , Kristian S. Thygesen
    • , Rainer Hillenbrand
    •  & Frank H. L. Koppens
  • Article |

    Active dielectric nanoantenna arrays exhibit low-threshold and high-quality-factor directional lasing achieved via a leaky resonance excited in coupled gallium arsenide (GaAs) nanopillars.

    • Son Tung Ha
    • , Yuan Hsing Fu
    • , Naresh Kumar Emani
    • , Zhenying Pan
    • , Reuben M. Bakker
    • , Ramón Paniagua-Domínguez
    •  & Arseniy I. Kuznetsov
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    A highly conductive, biocompatible and stretchable nanocomposite based on ultralong gold-coated silver nanowires allows for the realization of wearable and implantable bioelectronics.

    • Suji Choi
    • , Sang Ihn Han
    • , Dongjun Jung
    • , Hye Jin Hwang
    • , Chaehong Lim
    • , Soochan Bae
    • , Ok Kyu Park
    • , Cory M. Tschabrunn
    • , Mincheol Lee
    • , Sun Youn Bae
    • , Ji Woong Yu
    • , Ji Ho Ryu
    • , Sang-Woo Lee
    • , Kyungpyo Park
    • , Peter M. Kang
    • , Won Bo Lee
    • , Reza Nezafat
    • , Taeghwan Hyeon
    •  & Dae-Hyeong Kim
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    Self-reconstruction of conducting nanostructures assisted by a dynamically crosslinked polymer network enables the fabrication of autonomous self-healable and stretchable multi-component electronic skin.

    • Donghee Son
    • , Jiheong Kang
    • , Orestis Vardoulis
    • , Yeongin Kim
    • , Naoji Matsuhisa
    • , Jin Young Oh
    • , John WF To
    • , Jaewan Mun
    • , Toru Katsumata
    • , Yuxin Liu
    • , Allister F. McGuire
    • , Marta Krason
    • , Francisco Molina-Lopez
    • , Jooyeun Ham
    • , Ulrike Kraft
    • , Yeongjun Lee
    • , Youngjun Yun
    • , Jeffrey B.-H. Tok
    •  & Zhenan Bao
  • Article |

    An ultrasensitive miRNA sensor based on gold-coated magnetic nanoparticles modified with redox-labelled probe DNA is capable of detecting miRNA at a concentration of 10 aM to 1 nM in unprocessed blood, and following tumour-induced variation in miRNA levels.

    • Roya Tavallaie
    • , Joshua McCarroll
    • , Marion Le Grand
    • , Nicholas Ariotti
    • , Wolfgang Schuhmann
    • , Eric Bakker
    • , Richard David Tilley
    • , David Brynn Hibbert
    • , Maria Kavallaris
    •  & John Justin Gooding
  • Article |

    Gold nanoparticles typically considered inert in oxic waters accumulate in freshwater wetland subaquatic plants and are completely biotransformed to oxidized Au species by the associated cyanogenic biofilm.

    • Astrid Avellan
    • , Marie Simonin
    • , Eric McGivney
    • , Nathan Bossa
    • , Eleanor Spielman-Sun
    • , Jennifer D. Rocca
    • , Emily S. Bernhardt
    • , Nicholas K. Geitner
    • , Jason M. Unrine
    • , Mark R. Wiesner
    •  & Gregory V. Lowry
  • Article |

    Spikes on the surface of TiO2 microparticles, mimicking the nanotopological structures found on pathogens, boost the immune response in animal models and can be used to enhance the immunogenic effect of vaccines and adjuvants.

    • Ji Wang
    • , Hui-Jiuan Chen
    • , Tian Hang
    • , Yang Yu
    • , Guishi Liu
    • , Gen He
    • , Shuai Xiao
    • , Bo-ru Yang
    • , Chengduan Yang
    • , Fanmao Liu
    • , Jun Tao
    • , Mei X. Wu
    •  & Xi Xie