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Manipulating twisted electrons in strong-field ionization.

A S Maxwell1, G S J Armstrong2, M F Ciappina3

  • 1Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, UK. andrew.maxwell@ucl.ac.uk and ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain.

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|February 16, 2021
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Summary
This summary is machine-generated.

We explore the orbital angular momentum (OAM) of electrons released during strong-field ionization. Our findings offer a new interpretation of vortex interference patterns in experiments, linking OAM to electron behavior.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Mechanics
  • Strong-Field Physics

Background:

  • Strong-field ionization is a fundamental process where intense laser fields liberate electrons from atoms or molecules.
  • Vortex interferences in photoelectrons have been observed in experiments involving counter-rotating circularly polarized laser pulses.
  • Understanding the orbital angular momentum (OAM) of photoelectrons is crucial for interpreting these interference patterns.

Purpose of the Study:

  • To investigate the discrete orbital angular momentum (OAM) of photoelectrons generated via strong-field ionization.
  • To provide an alternative interpretation of experimental observations of vortex interferences in strong-field ionization.
  • To establish a connection between electron OAM and interference phenomena in strong-field ionization.

Main Methods:

  • Utilized the strong-field approximation (SFA) to derive an interference condition for electron vortices.
  • Performed computations using SFA, Qprop, and R-Matrix methods for a neon target.
  • Analyzed the OAM of photoelectrons across different computational approaches.

Main Results:

  • Derived an interference condition for vortices that shows excellent agreement with photoelectron momentum distributions.
  • Identified a small number of discrete vortex states localized in specific energy regions.
  • Demonstrated that vortices arise from the interference of pairs of twisted electron states, with OAM related to spiral arms.

Conclusions:

  • The study establishes a direct link between photoelectron OAM and vortex interference patterns in strong-field ionization.
  • A semiclassical relation for OAM was determined by recreating vortices with pairs of twisted electrons.
  • Proposed methods for direct OAM measurement and its application in time-resolved imaging of photo-induced dynamics.