Sub-cycle time-resolved nondipole dynamics in tunneling ionization

TL;DR

This paper presents a theoretical study of electron nondipole effects in tunneling ionization under elliptically polarized laser fields, revealing complex momentum correlations and nonadiabatic influences with implications for experimental detection.

Contribution

It introduces a relativistic Coulomb-corrected SFA approach and an improved Simpleman model to analyze nondipole dynamics in tunneling ionization, advancing understanding of electron momentum distributions.

Findings

Nondipole correlations between momentum components are characterized.

Deviations from experimental data are explained by nonadiabatic and Coulomb effects.

The study suggests feasible experimental observation of these effects.

Abstract

The electron nondipole dynamics in tunneling ionization in an elliptically polarized laser field is investigated theoretically using a relativistic Coulomb-corrected strong-field approximation (SFA) based on the eikonal approximation of the Klein-Gordon equation. We calculate attoclock angle-resolved light-front momentum distributions at different ellipticities of the laser field in quasistatic and nonadiabatic regimes and analyze them with an improved Simpleman model. The nondipole correlations between longitudinal and transverse momentum components are examined. Deviations of the photoelectron momentum distribution calculated via SFA with respect to the available experimental results as well as with the improved Simpleman model are discussed and interpreted in terms of nonadiabatic as well as Coulomb effects in the continuum and under-the-barrier. The favorable prospects of an experimental observation are discussed.