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Unveiling the bosonic nature of an ultrashort few-electron pulse

Abstract : Quantum dynamics is very sensitive to dimensionality. While two-dimensional electronic systems form Fermi liquids, one-dimensional systems—Tomonaga–Luttinger liquids—are described by purely bosonic excitations, even though they are initially made of fermions. With the advent of coherent single-electron sources, the quantum dynamics of such a liquid is now accessible at the single-electron level. Here, we report on time-of-flight measurements of ultrashort few-electron charge pulses injected into a quasi one-dimensional quantum conductor. By changing the confinement potential we can tune the system from the one-dimensional Tomonaga–Luttinger liquid limit to the multi-channel Fermi liquid and show that the plasmon velocity can be varied over almost an order of magnitude. These results are in quantitative agreement with a parameter-free theory and demonstrate a powerful probe for directly investigating real-time dynamics of fractionalisation phenomena in low-dimensional conductors.
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Grégoire Roussely, Everton Arrighi, Giorgos Georgiou, Shintaro Takada, Martin Schalk, et al.. Unveiling the bosonic nature of an ultrashort few-electron pulse. Nature Communications, Nature Publishing Group, 2018, 9, pp.2811. ⟨10.1038/s41467-018-05203-7⟩. ⟨cea-01881966⟩

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