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Updated: Sep 10, 2025

Scanning-probe Single-electron Capacitance Spectroscopy
Published on: July 30, 2013
Coulomb Sensing of Single Ballistic Electrons
J D Fletcher1, W Park2,3, P See1
1National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom.
None:
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 characterize the nanoscale potential landscape of the beam splitter and the strength of the Coulomb interaction. We also show multielectron sensing with picosecond resolution.
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