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Real-time tracking of coherent oscillations of electrons in a nanodevice by photo-assisted tunnelling

Author

Listed:
  • Yang Luo

    (Max Planck Institute for Solid State Research)

  • Frank Neubrech

    (Max Planck Institute for Solid State Research
    University of Stuttgart)

  • Alberto Martin-Jimenez

    (Max Planck Institute for Solid State Research)

  • Na Liu

    (Max Planck Institute for Solid State Research
    University of Stuttgart)

  • Klaus Kern

    (Max Planck Institute for Solid State Research
    Ecole Polytechnique Fédérale de Lausanne)

  • Manish Garg

    (Max Planck Institute for Solid State Research)

Abstract

Coherent collective oscillations of electrons excited in metallic nanostructures (localized surface plasmons) can confine incident light to atomic scales and enable strong light-matter interactions, which depend nonlinearly on the local field. Direct sampling of such collective electron oscillations in real-time is crucial to performing petahertz scale optical modulation, control, and readout in a quantum nanodevice. Here, we demonstrate real-time tracking of collective electron oscillations in an Au bowtie nanoantenna, by recording photo-assisted tunnelling currents generated by such oscillations in this quantum nanodevice. The collective electron oscillations show a noninstantaneous response to the driving laser fields with a T2 decay time of nearly 8 femtoseconds. The contributions of linear and nonlinear electron oscillations in the generated tunnelling currents were precisely determined. A phase control of electron oscillations in the nanodevice is illustrated. Functioning in ambient conditions, the excitation, phase control, and read-out of coherent electron oscillations pave the way toward on-chip light-wave electronics in quantum nanodevices.

Suggested Citation

  • Yang Luo & Frank Neubrech & Alberto Martin-Jimenez & Na Liu & Klaus Kern & Manish Garg, 2024. "Real-time tracking of coherent oscillations of electrons in a nanodevice by photo-assisted tunnelling," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45564-w
    DOI: 10.1038/s41467-024-45564-w
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    References listed on IDEAS

    as
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