We investigate two-electron interference in free space using two laser-triggered needle tips as independent electron sources, a fermionic realisation of the landmark Hanbury Brown and Twiss interferometer. We calculate the two-electron interference pattern in a quantum path formalism taking into account the fermionic nature and the spin configuration of the electrons. We also estimate the Coulomb repulsion in the setup in a semiclassical approach. We find that antibunching resulting from Pauli's exclusion principle and repulsion stemming from the Coulomb interaction can be clearly distinguished.
@article{arxiv.2401.17088,
title = {Hanbury Brown and Twiss interference of electrons in free space from independent needle tip sources},
author = {Anton Classen and Raul Corrêa and Florian Fleischmann and Simon Semmler and Marc-Oliver Pleinert and Peter Hommelhoff and Joachim von Zanthier},
journal= {arXiv preprint arXiv:2401.17088},
year = {2025}
}