Nondipole effects in tunneling ionization by intense laser pulses

Abstract

The limit of decreasing laser frequency can not be considered independently from nondipole effects due to increase in the laser-induced continuum electron speed in this limit. Therefore, in this work, tunneling ionization in the adiabatic limit is considered for an effective field that includes effects beyond the electric-dipole term to first order in $1/c$, with $c$ the speed of light. The nondipole term describes the interaction resulting from the electric dipole-induced velocity of the electron and the magnetic field component of the laser. The impact of this term on the ionization rate, tunnel exit point, momentum at the tunnel exit and electron dynamics is discussed. In the appropriate limit, the results of a nondipole strong-field approximation approach and those of the strict adiabatic limit, where time and field strength are parameters, are consistent. The nondipole strong-field approximation approach is used to identify nonadiabatic modifications of the initial conditions. The results open up an avenue to include nondipole effects in the initial tunneling ionization step in semiclassical models of strong-field and attosecond physics.

9 pages, 3 figures

References in corpus (7)

• Photoelectron angular distributions from strong-field ionization of oriented molecules
• Breakdown of the Dipole Approximation in Strong-Field Ionization
• Partitioning of the linear photon momentum in multiphoton ionization
• Quantitative rescattering theory for laser-induced high-energy plateau photoelectron spectra
• Under-the-barrier dynamics in laser-induced relativistic tunneling
• The tunneling model of laser-induced ionization and its failure at low frequencies
• Nondipole photoelectron momentum shifts in strong-field ionization with mid-infrared laser pulses of long duration

Cited by in corpus (6)

• Subcycle resolved strong-field tunneling ionization: Identification of magnetic dipole and electric quadrupole effects
• Disappearance and reappearance of above-threshold-ionization peaks
• Controlling Magnetic and Electric Nondipole Effects with Synthesized Two Perpendicularly Propagating Laser Fields
• Beyond Electric-Dipole Treatment of Light-Matter Interactions in Materials: Nondipole Harmonic Generation in Bulk Si
• Relativistic analytical R-matrix (ARM) theory for strong-field ionization
• Comparison between Jacobi-Anger and saddle point methods to treat Above-threshold ionization