Theory of Subcycle Linear Momentum Transfer in Strong-Field Tunneling Ionization

Ni, Hongcheng; Brennecke, Simon; Gao, Xiang; He, Pei-Lun; Donsa, Stefan; Březinová, Iva; He, Feng; Wu, Jian; Lein, Manfred; Tong, Xiao-Min; Burgdörfer, Joachim

doi:10.1103/physrevlett.125.073202

Cited by 56 publications

(40 citation statements)

References 60 publications

(94 reference statements)

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“…For dynamics beyond the dipole approximation, one might question the initial conditions based on a calculation in the dipole approximation. Although the method proved to be successful to explain the experimental results [5,7,8] and effects beyond the dipole approximation onto bound states are expected to be minor, modifications might be needed to fully account for non-dipole effects even on the initial wave packet [8,68].…”

Section: Tunnel Ionization Two-step Model and Ctmc Methodsmentioning

confidence: 99%

“…Relativistic and non-dipole versions of the SFA have been reported [22,35,68,[74][75][76][77][78]. A common approach to facilitate the calculation is the approximation of the spatial integral in the transition amplitude with the saddle-point approximation [68,75]. This approximation comes however with the loss of information about the influence of the initial state.…”

Section: Strong-field Approximationmentioning

confidence: 99%

“…Solutions of the TDSE beyond the dipole approximation have been reported in references [22,29,36,68,[81][82][83][84][85][86][87].…”

Section: Time-dependent Schrödinger Equationmentioning

confidence: 99%

“…So far, there is only one study on the theory of the subcycle linear multiphoton momentum transfer that was published very recently [68]. The authors present numerical solutions of the sub-cycle resolved momentum shift along the beam propagation direction with SFA and TDSE calculations alongside with analytical solutions.…”

Section: Effect On Final Photoelectron Momentum As a Function Of The Ionization Phasementioning

confidence: 99%

“…Furthermore, they found a sub-cycle dependence of the initial electron momentum that is attributed to the coupling of non-adiabatic effects with the linear photon Figure 6. The initial momentum in beam propagation direction as a function of the ionization phase for 800 nm and 3400 nm at an intensity of 1 • 10 14 W cm −2 and an ellipticity of = 0.8 caused by the non-adiabatic coupling with non-dipole effects according to equation (S34) of reference [68]. The variation over the ionization phase is significantly smaller for 3400 nm than for 800 nm, indicating that this influence of the non-adiabatic coupling with non-dipole effects plays only a minor role in the mid-IR.…”

Section: Effect On Final Photoelectron Momentum As a Function Of The Ionization Phasementioning

confidence: 99%

See 4 more Smart Citations

Ionization in intense laser fields beyond the electric dipole approximation: concepts, methods, achievements and future directions

Mäurer

Keller

2021

J. Phys. B: At. Mol. Opt. Phys.

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The electric dipole approximation is widely used in atomic, molecular and optical physics and is typically related to a regime for which the wavelength is much larger than the atomic structure. However, studies have shown that in strong laser fields another regime exists where the dipole approximation breaks down. During the ionization process in intense laser fields and at long wavelengths the photoelectrons can reach higher velocities such that the magnetic field component of the laser field becomes significant. The ionization dynamics and the final momentum of the electron is therefore modified by the entire Lorentz force. In contrast the magnetic field interaction is neglected in the dipole approximation. Rapid developments in laser technology and advancements in the accuracy of the measurements techniques have enabled the observation of the influence of such non-dipole effects on the final angular photoelectron momentum distributions. More recently the number of studies on ionization beyond the dipole approximation has increased significantly, providing more important insight into fundamental properties of ionization processes. For example we have shown that the final three dimensional photoelectron momentum spectra is significantly affected by the non-dipole drift with the parent-ion interaction, the linear multiphoton momentum transfer on a sub-cycle time scale and the sharing of the transferred linear photon momenta between the electron and the ion. In this article we present an overview of the underlying mechanisms and we review the experimental techniques and the achievements in this field. We focus on ionization in strong laser fields in the regime where the dipole approximation is not valid but a fully relativistic description is not required.

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Section: Tunnel Ionization Two-step Model and Ctmc Methodsmentioning

confidence: 99%

Section: Strong-field Approximationmentioning

confidence: 99%

“…Solutions of the TDSE beyond the dipole approximation have been reported in references [22,29,36,68,[81][82][83][84][85][86][87].…”

Section: Time-dependent Schrödinger Equationmentioning

confidence: 99%

Section: Effect On Final Photoelectron Momentum As a Function Of The Ionization Phasementioning

confidence: 99%

Section: Effect On Final Photoelectron Momentum As a Function Of The Ionization Phasementioning

confidence: 99%

See 3 more Smart Citations

Ionization in intense laser fields beyond the electric dipole approximation: concepts, methods, achievements and future directions

Mäurer

Keller

2021

J. Phys. B: At. Mol. Opt. Phys.

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Nondipole Effects in Atomic Ionization Induced by an Intense Counter‐Rotating Bicircular Laser Field

et al. 2023

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Nondipole effects occurring in the process of atomic ionization by an intense, mid-infrared, counter-rotating bicircular laser field are investigated using the strong-field approximation with leading-order nondipole corrections. The time integrals appearing in the expression for the differential ionization rate are computed in two ways: numerically, and by applying the saddle-point approximation. The nondipole corrections introduce an asymmetry in the photoelectron momentum distribution along the field propagation direction. The asymmetry is quantified by the partial average value of the propagation-direction momentum component of the photoelectrons and by the normalized difference of the differential ionization rates computed including and excluding the nondipole corrections. Using the saddle-point approximation, it is investigated how the nondipole corrections change the solutions for direct photoelectrons and how this affects the momentum spectra. The impact of nondipole corrections increases with increasing photoelectron energy. Analysis of the complete photoelectron spectra including both direct and rescattered photoelectrons shows that, in the low-energy region, a shift against the propagation direction occurs. The partial average of the propagation-direction momentum component in the rescattering region exhibits a plateau structure and also a local minimum structure that was recently observed in an experiment with a linearly polarized laser field (Lin et al., Phys Rev. Lett. 128, 023201 (2022)).

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Self-consistent extraction of photoabsorption time delays in attosecond streak camera

Gao,

Ni,

Becker

et al. 2024

Sci. China Phys. Mech. Astron.

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Theory of Subcycle Linear Momentum Transfer in Strong-Field Tunneling Ionization

Cited by 56 publications

References 60 publications

Ionization in intense laser fields beyond the electric dipole approximation: concepts, methods, achievements and future directions

Ionization in intense laser fields beyond the electric dipole approximation: concepts, methods, achievements and future directions

Nondipole Effects in Atomic Ionization Induced by an Intense Counter‐Rotating Bicircular Laser Field

Self-consistent extraction of photoabsorption time delays in attosecond streak camera

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