Does an Electron Pair Diffract as a Whole?
The correlated behavior of the electrons in atoms, molecules and solids has been, and still is, a crucial issue for the quantum mechanics. Lately, experiments in which either a photon or an electron ionizes a system generating a pair of unbound electrons have shown to be particularly sensitive to correlations. In this paper a brief selection of such experiments is presented aiming at highlighting conditions under which the two final electrons behave as a single entity rather than two independent ones. It is concluded that whenever the pair generation occurs on an attosecond timescale the pair is strongly correlated, i.e. it is entangled, and the electrons continuously share between them the energy in excess to the pair creation threshold.
Partial financial support through SIMDALEE2 Sources, Interaction with Matter, Detection and Analysis of Low Energy Electrons 2 Marie Skłodowska Curie FP7-PEOPLE-2023-INT Grant \(\#\)606988, is greatly acknowledged.
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