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Pré-Publication, Document De Travail Année : 2023

Evidence of coherence in strong-field electron photoemission from a semiconductor

Résumé

Strong-field quantum electronics is emerging as a potential candidate in information processing but still coherence vs decoherence is a primary concern of the concept. Strong-field coherent processes in band gap materials have led during the last decade to the emergence of high harmonic generation in semiconductors, petahertz electronics, or strong-field quantum states. However, the coherent behavior of the sub-optical cycle-driven electrons has never been directly observed. We report here on the experimental evidence of coherent ultrashort emission of hot electrons from a nanostructured semiconductor. Our method uses sub-wavelength electric field enhancement to localize the electron emission within a nanometer-scale spot. We found similarities with the electron emission from metallic nanotips in the strong-field regime, a topic that has opened a vast domain of applications during the last decade. The electron spectra display both odd and even harmonic orders of the driving femtosecond laser frequency, a signature of the coherent nature of the electron emission and their attosecond timing. Our findings complete our knowledge of phenomena governing coherent strong-field processes in semiconductors and open perspectives for the generation of future quantum devices operating in the strong-field regime.

Dates et versions

hal-04329924 , version 1 (07-12-2023)

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Marie Froidevaux, Ludovic Douillard, Willem Boutu, Milutin Kovacev, Philippe Zeitoun, et al.. Evidence of coherence in strong-field electron photoemission from a semiconductor. 2023. ⟨hal-04329924⟩
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