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Volume 5 Issue 6, June 2022

AI chips stack up

Stackable chips that use optoelectronic device arrays for chip-to-chip communication and neuromorphic cores based on memristor crossbar arrays for parallel data processing could be used to create energy-efficient sensor-computing systems for artificial intelligence (AI) applications. The optical microscopy image on the cover shows an AI processor chip, which can be combined with a range of different sensor and computing chips depending on the requirements of the application.

See Choi et al. and News & Views by Miao

Image: Jeehwan Kim, Chanyeol Choi, Hyunseok Kim, Ji-Hoon Kang and Min-Kyu Song. Cover Design: Lauren Heslop.


  • Thermal management technology is essential in the development of electronic systems, and techniques that can deliver efficient cooling continue to evolve.



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Research Highlights

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News & Views

  • The phase, frequency and amplitude of gigahertz acoustic waves can be electrically controlled in a lithium niobate waveguide at millikelvin temperatures.

    • Anton Frisk Kockum
    News & Views
  • A reconfigurable integration technology based on stackable chips with embedded arrays of optoelectronic devices and memristive crossbars could be of use in edge intelligence applications.

    • Shi-Jun Liang
    • Feng Miao
    News & Views
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Research Briefings

  • Transistors based on two-dimensional semiconductors suffer from electrical instabilities because charges readily get trapped in the gate oxides. As charge trapping is sensitive to the energetic alignment of the channel Fermi level to the defect bands in the oxide, the number of electrically active traps can be reduced by tuning the channel Fermi level.

    Research Briefing
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  • This Review examines the development of micro-thermoelectric devices, exploring progress in device design, integration and performance, and the potential applications of the technology in cooling, power generation and sensing.

    • Qihao Zhang
    • Kangfa Deng
    • Kornelius Nielsch
    Review Article
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  • The electro-acoustic effect can be used to electrically control the phase velocity of travelling acoustic waves in a lithium niobate waveguide, and to construct devices that can modulate the phase, frequency and amplitude of acoustic waves, even at the limit of single phonons.

    • Linbo Shao
    • Di Zhu
    • Marko Lončar
  • The stability of graphene-based field-effect transistors with amorphous aluminium oxide serving as the top-gate oxide can be improved by tuning the Fermilevel of the two-dimensional channel material such that it maximizes the energy distance between the charge carriers in the channel and the defect bands in the gate oxide.

    • Theresia Knobloch
    • Burkay Uzlu
    • Tibor Grasser
    Article Open Access
  • Non-volatile analogue switches made from molybdenum disulfide can operate at frequencies of 480 GHz and achieve data transmission rates of 100 Gbit s–1, making them of potential use in sixth-generation communication technology.

    • Myungsoo Kim
    • Guillaume Ducournau
    • Deji Akinwande
  • A lightweight, flexible technology that displays vibro-tactile patterns across large areas of the skin in single units or through a wirelessly coordinated collection of them can be used to convey map directions for road navigation, translate musical tracks into tactile patterns and reconstruct tactile sensations for feedback control of robotic prosthetics.

    • Yei Hwan Jung
    • Jae-Young Yoo
    • John A. Rogers
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Amendments & Corrections

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