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Journal of Physics Conference Series

Electron Matter-Wave Vortices in Double Photoionization of Helium by Attosecond Pulses

J. M. Ngoko Djiokap, Alexei V. Meremianin, Nikolai L. Manakov, S. X. Hu, Lars Bojer Madsen, Anthony F. Starace

Published Jul 1, 2017• 0 citations
Publisher
DOI
10.1088/1742-6596/875/3/022014

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When small quantum systems, atoms or molecules, absorb a high-energy photon, electrons are emitted with a well-defined energy and a highly symmetric angular distribution, ruled by energy quantization and parity conservation. These rules are based on approximations and symmetries which may break down when atoms are exposed to ultrashort and intense optical pulses. This raises the question of their universality for the simplest case of the photoelectric effect. Here we investigate photoionization of helium by a sequence of attosecond pulses in the presence of a weak infrared laser field. We continuously control the energy of the photoelectrons and introduce an asymmetry in their emission direction, at variance with the idealized rules mentioned above. This control, made possible by the extreme temporal confinement of the light-matter interaction, opens a road in attosecond science, namely, the manipulation of ultrafast processes with a tailored sequence of attosecond pulses.
Abstract State-of-the-art attosecond photoionization experiments are identified as a new platform to test Born’s rule—a postulate of quantum mechanics. A simulation of the so-called Sorkin test under typical experimental conditions infers an achievable measurement precision in the range of the best Sorkin tests to date, demonstrating new opportunities for high-precision tests of Born’s rule via nonlinear matter-wave interferometry. The potential of attosecond photoionization for further fundamental tests of quantum mechanics is discussed.