Helicity Transfer in Strong Laser Fields via the Electron Anomalous Magnetic Moment

• Date:2025-04-30
• Title of Paper:Helicity Transfer in Strong Laser Fields via the Electron Anomalous Magnetic Moment
• Journal:Physical Review Letters
• Summary:Electron beam longitudinal polarization during the interaction with counterpropagating circularly
  polarized ultraintense laser pulses is investigated, while accounting for the anomalous magnetic moment of
  the electron. Although it is known that the helicity transfer from the laser photons to the electron beam is
  suppressed in linear and nonlinear Compton scattering processes, we show that the helicity transfer
  nevertheless can happen via an intermediate step of the electron radiative transverse polarization, phase
  matched with the driving field, followed up by spin rotation into the longitudinal direction as induced by
  the anomalous magnetic moment of the electron. With spin-resolved QED Monte Carlo simulations, we
  demonstrate the consequent helicity transfer from laser photons to the electron beam with a degree up to
  10%, along with an electron radial polarization up to 65% after multiple photon emissions in a femtosecond
  timescale. This effect is detectable with currently achievable laser facilities, evidencing the role of the
  leading QED vertex correction to the electron anomalous magnetic moment in the polarization dynamics in
  ultrastrong laser fields.
• Co-author:Yan-Fei Li , Yue-Yue Chen, Karen Z. Hatsagortsyan, Christoph H. Keitel
• Volume:128
• Page Number:174801
• Translation or Not:No
• Date of Publication:2022-04-27