Coulomb sensing of single ballistic electrons

2024/12/20 by Julian Fletcher, Fletcher, J. D., W. Park +15
Materials Science · Physics and Astronomy · Engineering · #Electron and X-Ray Spectroscopy Techniques #Nuclear Physics and Applications #Advanced Materials Characterization Techniques

paper · pdf · doi:10.48550/arxiv.2412.15789

Abstract

While ballistic electrons are a key tool for applications in sensing and flying qubits, sub-nanosecond propagation times and complicated interactions make control of ballistic single electrons challenging. Recent experiments have revealed Coulomb collisions of counterpropagating electrons in a beam splitter, giving time resolved control of interactions between single electrons. Here we use remote Coulomb interactions to demonstrate a scheme for sensing single ballistic electrons. We show that interactions are highly controllable via electron energy and emission timing. We use a weakly-coupled `sensing' regime to characterise the nanoscale potential landscape of the beam splitter and the strength of the Coulomb interaction, and show multi-electron sensing with picosecond resolution.

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