Optical vortices discern attosecond time delay in electron emission from magnetic sublevels

Abstract

Photoionization from energetically distinct electronic states may have a relative time delay of tens of attoseconds. Here we demonstrate that pulses of optical vortices allow measuring such attoseconds delays from magnetic sublevels, even from a spherically symmetric target. The difference in the time delay is substantial and exhibits a strong angular dependence. Furthermore, we find an atomic scale variation in the time delays depending on the target orbital position in the laser spot. The findings offer thus a qualitatively new way for a spatio-temporal sensing of the magnetic states from which the photoelectrons originate, with a spatial resolution way below the diffraction limit of the vortex beam. Our conclusions follow from analytical considerations based on symmetry, complemented and confirmed with full numerical simulations of the quantum dynamics.

arXiv comment9 pages, 6 figures

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Cited by in corpus (5)

• Electromagnetic theory of Helicoidal Dichroism in reflection from magnetic structures
• Signatures of the orbital angular momentum of an infrared light beam in the two-photon transition matrix element: A step toward attosecond chronoscopy of photoionization
• Electrons in intense laser fields with local phase, polarization, and skyrmionic textures
• Spatio-temporal delay in photoionization by polarization structured laser fields
• Photoelectron emission via time and phase-tailored electromagnetic fields