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

Yang Luo, Frank Neubrech, Alberto Martin-Jimenez, Na Liu, Klaus Kern and Manish Garg ()
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Yang Luo: Max Planck Institute for Solid State Research
Frank Neubrech: Max Planck Institute for Solid State Research
Alberto Martin-Jimenez: Max Planck Institute for Solid State Research
Na Liu: Max Planck Institute for Solid State Research
Klaus Kern: Max Planck Institute for Solid State Research
Manish Garg: Max Planck Institute for Solid State Research

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-45564-w

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