Magnetic-Field effect in Laser-assisted XUV ionization

TL;DR

This paper investigates the magnetic-field effects in laser-assisted XUV ionization, revealing how magnetic fields distort photoelectron momentum distributions and affect streaking spectra, thus advancing understanding of time-resolved nondipole effects.

Contribution

It provides a numerical and analytical study of magnetic-field effects on photoelectron momentum and streaking spectra in laser-assisted XUV ionization, highlighting nondipole influences.

Findings

Magnetic fields distort photoelectron momentum distributions.

Magnetic effects cause a momentum shift dependent on transverse momentum and time delay.

The time shift from streaking spectra remains unaffected by magnetic fields.

Abstract

The magnetic-field effect of the laser pulse is investigated in laser-assisted XUV ionization. By numerically solving the three-dimensional time-dependent Schr\"odinger equation, we find that the photoelectron momentum distribution is distorted by the magnetic-field effect of the IR streaking field. It results in a transverse-momentum- and time-delay-dependent longitudinal photoelectron momentum shift, which is further analytically confirmed by employing the nondipole corrected strong field approximation. We also demonstrate that the magnetic field does not affect the time shift retrieved from the streaking spectrum, although the streaking spectrum is apparently altered by the momentum shift induced by the magnetic-field effect. Our work reveals the time-resolved nondipole effect of the laser pulse by the attosecond streaking technique.