Two-color phase-of-the-phase spectroscopy applied to nonperturbative electron-positron pair production in strong oscillating electric fields

Bräss, J.; Milbradt, R.; Villalba-Chávez, Selym; Paulus, Gerhard G.; Müller, Carsten

doi:10.1103/physreva.101.043401

Cited by 15 publications

(11 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The idea was advanced further in Ref. [271], where phase-of-the-phase spectroscopy [272] was discussed for nonperturbative Schwinger electron-positron pair production in strong two-colour oscillating electric fields (cf. also [273]).…”

Section: Multi-colour Laser Fieldsmentioning

confidence: 99%

Advances in QED with intense background fields

Fedotov¹,

Ilderton²,

Karbstein³

et al. 2022

Preprint

View full text Add to dashboard Cite

Upcoming and planned experiments combining increasingly intense lasers and energetic particle beams will access new regimes of nonlinear, relativistic, quantum effects. This improved experimental capability has driven substantial progress in QED in intense background fields. We review here the advances made during the last decade, with a focus on theory and phenomenology. As ever higher intensities are reached, it becomes necessary to consider processes at higher orders in both the number of scattered particles and the number of loops, and to account for non-perturbative physics (e.g. the Schwinger effect), with extreme intensities requiring resummation of the loop expansion. In addition to increased intensity, experiments will reach higher accuracy, and these improvements are being matched by developments in theory such as in approximation frameworks, the description of finite-size effects, and the range of physical phenomena analysed. Topics on which there has been substantial progress include: radiation reaction, spin and polarisation, nonlinear quantum vacuum effects and connections to other fields including physics beyond the Standard Model.

show abstract

Section: Multi-colour Laser Fieldsmentioning

confidence: 99%

Advances in QED with intense background fields

Fedotov¹,

Ilderton²,

Karbstein³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…To quantitatively characterize the relative phase dependence of the signal, we further analyze the NDs employing the phaseof-the-phase spectroscopy, 37,38 which has been proposed to reveal the different orbits in strong-field ionization. [39][40][41] In this method, the higher-order Fourier component of NDs is very small, and thus it is canceled out safely here. Figure 2(a) shows an example of the signal at the momentum p ¼ ð−0.6; 0.1Þ a.u.…”

Section: Resultsmentioning

confidence: 99%

Resolving and weighing the quantum orbits in strong-field tunneling ionization

Tan

et al. 2021

Adv. Photon.

View full text Add to dashboard Cite

Tunneling ionization of atoms and molecules induced by intense laser pulses contains the contributions of numerous quantum orbits. Identifying the contributions of these orbits is crucial for exploring the application of tunneling and for understanding various tunneling-triggered strong-field phenomena. We perform a combined experimental and theoretical study to identify the relative contributions of the quantum orbits corresponding to the electrons tunneling ionized during the adjacent rising and falling quarter cycles of the electric field of the laser pulse. In our scheme, a perturbative second-harmonic field is added to the fundamental driving field. By analyzing the relative phase dependence of the signal in the photoelectron momentum distribution, the relative contributions of these two orbits are unambiguously determined. Our results show that their relative contributions sensitively depend on the longitudinal momentum and modulate with the transverse momentum of the photoelectron, which is attributed to the interference of the electron wave packets of the long orbit. The relative contributions of these orbits resolved here are important for the application of strong-field tunneling ionization as a photoelectron spectroscopy for attosecond time-resolved measurements.

show abstract

“…Mathematically, the value of Φ POP represents the waiting time (Φ POP < 0) or the passed time (Φ POP > 0) of the appearing instant of the yield peak with respect to the instant of φ RP = 0 during the yield oscillation. However, a clear physical meaning of Φ POP is not identified in previous phase-of-phase experiments [18][19][20][21][22][23] .…”

Section: /19mentioning

confidence: 87%

“…Recently, the phase-of-phase photoelectron spectroscopy was introduced to extract the scattering structural information of atoms, molecules and nanoparticles [18][19][20][21][22][23] , in which the momentum-resolved electron yield is Fourier transformed with respect to the relative phase between two-color laser fields to obtain the phase of the yield oscillation, which is the so-called phase of the phase. The phase-of-phase spectrum provides rich dynamical information than the static photoelectron spectra measured in the one-color field.…”

mentioning

confidence: 99%

Complete characterization of sub-Coulomb-barrier tunnelling with phase-of-phase attoclock

Han

Wang

et al. 2021

Nat. Photon.

View full text Add to dashboard Cite

Laser-induced electron tunneling, triggering a broad range of ultrafast phenomena such as the generation of attosecond light pulses, photoelectron diffraction and holography, has laid the foundation of strong-field physics and attosecond science. Using the attoclock constructed by single-color elliptically polarized laser fields, previous experiments have measured the tunneling rates, exit positions, exit velocities and delay times for some specific electron trajectories, which are mostly born at the field peak instant where the laser electric field and the formed potential barrier are stationary in terms of the derivative versus time. From the view of the wave-particle dualism, the electron phase under a classically forbidden, tunneling barrier has not been measured, which is at the heart of quantum tunneling physics. Here we present a robust measurement of tunneling dynamics including the electron sub-barrier phase and amplitude. We combine attoclock technique with two-color phase-of-the-phase spectroscopy to accurately calibrate the angular streaking relation and to probe the non-stationary tunneling dynamics by manipulating a rapidly changing potential barrier. This phase-of-phase attoclock (POP attoclock) directly links the measured phase of the two-color relative phase with the ionization instant for the photoelectron with any final momentum on the "detector", which allows us to reconstruct the imaginary tunneling time and the accumulated phase under the barrier. The POP attoclock provides a general time-resolved approach to access the underlying quantum dynamics in intense-light-matter interactions.

show abstract

Two-color phase-of-the-phase spectroscopy applied to nonperturbative electron-positron pair production in strong oscillating electric fields

Cited by 15 publications

References 63 publications

Advances in QED with intense background fields

Advances in QED with intense background fields

Resolving and weighing the quantum orbits in strong-field tunneling ionization

Complete characterization of sub-Coulomb-barrier tunnelling with phase-of-phase attoclock

Contact Info

Product

Resources

About