Angle-resolved time delays for shake-up ionization of helium

Donsa, Stefan; Ederer, Manuel; Pazourek, Renate; Burgdörfer, Joachim; Březinová, Iva

doi:10.1103/physreva.102.033112

Cited by 11 publications

(4 citation statements)

References 56 publications

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“…( 8)), can be written in terms of a Fourier series in the relative phase φ. The emission signal takes the form [51] S…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Phase delays in $ω-2ω$ above-threshold ionization

López,

Donsa,

Nagele

et al. 2021

Preprint

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Relative phases of atomic above-threshold ionization wavepackets have been investigated in a recent experiment [L. J. Zipp, A. Natan, and P. H. Bucksbaum, Optica 1, 361-364 (2014)] exploiting interferences between different pathways in a weak probe field at half the frequency of the strong ionization pulse. In this work we theoretically explore the extraction of phase delays and time delays of attosecond wavepackets formed in strong-field ionization. We perform simulations solving the time-dependent Schrödinger equation and compare these results with the strong-field and Coulomb-Volkov approximations. In order to disentangle short-from long-ranged effects of the atomic potential we also perform simulations for atomic model potentials featuring a Yukawa-type short-range potential. We find significant deviations of the ab-initio phase delays between different photoelectron pathways from the predictions by the strong-field approximation even at energies well above the ionization threshold. We identify similarities but also profound differences to the well-known interferometric extraction of phase-and time delays in one-photon ionization.

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“…( 8)), can be written in terms of a Fourier series in the relative phase φ. The emission signal takes the form [51] S…”

Section: Methodsmentioning

confidence: 99%

“…where the leading term (i = 1) provides the information of the relative ionization phase δ 1 (E) = δ(E) in analogy to the RABBIT protocol [51]. Higher-order Fourier components c i (E) for {i = 2, 3...} should provide an error estimate of the fit.…”

Section: Methodsmentioning

confidence: 99%

Phase delays in $ω-2ω$ above-threshold ionization

López,

Donsa,

Nagele

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Not surprisingly, similar situations occur in the shakeup ionization channel of the helium atom. [80] If the target is a heavier rare gas atom where the ionizing shell is np, the EWS time delay itself also becomes angular dependent. [81,82] In addition, near the Fano resonance of Ar, a strong anisotropic photoionization delay has been found.…”

Section: Recent Advancesmentioning

confidence: 99%

Attosecond ionization time delays in strong-field physics

Ma 马,

Ni 倪,

Wu 吴

2024

Chinese Phys. B

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Electronic processes within atoms and molecules reside on the timescale of attoseconds. Recent advances in the laser-based pump-probe interrogation techniques have made possible the temporal resolution of ultrafast electronic processes on the attosecond timescale, including photoionization and tunneling ionization. These interrogation techniques include the attosecond streak camera, the reconstruction of attosecond beating by interference of two-photon transitions, and the attoclock. While the former two are usually employed to study photoionization processes, the latter is typically used to investigate tunneling ionization. In this Topical Review, we briefly overview these timing techniques towards an attosecond temporal resolution of ionization processes in atoms and molecules under intense laser fields. In particular, we review the backpropagation method, which is a novel hybrid quantum-classical approach towards full characterization of tunneling ionization dynamics. Continued advances in the interrogation techniques promise to pave the pathway towards the exploration of ever faster dynamical processes on an ever shorter timescale.

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“…Recently linear scaling with

{N}_t

has become feasible within the G1–G2 scheme, [ 13,14 ] which could be demonstrated even for advanced self‐energy approximations like

\mathrm{GW}

and the particle–particle and particle–hole T ‐matrix approximations. Moreover, the full nonequilibrium version of the dynamically screened ladder approximation could be implemented, for lattice models, [ 15,16 ] for details of the scheme, see Reference [17]. The advantage of the linear scaling in the G1–G2 scheme comes with a cost: the simultaneous propagation of the time‐diagonal single‐particle and correlated two‐particle Green functions,

{G}_1(t)

and

{\mathcal{G}}_2(t)

, demands a substantial computational effort for computing and storing all matrix elements of

{\mathcal{G}}_2

.…”

Section: Introductionmentioning

confidence: 99%

Classical and quantum theory of fluctuations for many‐particle systems out of equilibrium

Schroedter,

Bonitz

2024

Contributions to Plasma Physics

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Correlated classical and quantum many‐particle systems out of equilibrium are of high interest in many fields, including dense plasmas, correlated solids, and ultracold atoms. Accurate theoretical description of these systems is challenging both, conceptionally and with respect to computational resources. While for classical systems, in principle, exact simulations are possible via molecular dynamics, this is not the case for quantum systems. Alternatively, one can use many‐particle approaches such as hydrodynamics, kinetic theory, or nonequilibrium Green functions (NEGF). However, NEGF exhibit a very unfavorable cubic scaling of the CPU time with the number of time steps. An alternative is the G1–G2 scheme [N. Schlünzen et al., Phys. Rev. Lett. 124, 076601 (2020)] which allows for NEGF simulations with time linear scaling, however, at the cost of large memory consumption. The reason is the need to store the two‐particle correlation function. This problem can be overcome for a number of approximations by reformulating the kinetic equations in terms of fluctuations – an approach that was developed, for classical systems, by Yu.L. Klimontovich [JETP 33, 982 (1957)]. Here, we present an overview of his ideas and extend them to quantum systems. In particular, we demonstrate that this quantum fluctuations approach can reproduce the nonequilibrium GW approximation [E. Schroedter et al., Cond. Matt. Phys. 25, 23401 (2022)] promising high accuracy at low computational cost which arises from an effective semiclassical stochastic sampling procedure. We also demonstrate how to extend the approach to the two‐time exchange‐correlation functions and the density response properties. [E. Schroedter et al., Phys. Rev. B 108, 205109 (2023)]. The results are equivalent to the Bethe–Salpeter equation for the two‐time exchange‐correlation function when the generalized Kadanoff‐Baym ansatz with Hartree‐Fock propagators is applied [E. Schroedter and M. Bonitz, phys. stat. sol. (b) 2024, 2300564].

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Angle-resolved time delays for shake-up ionization of helium

Cited by 11 publications

References 56 publications

Phase delays in $ω-2ω$ above-threshold ionization

Phase delays in $ω-2ω$ above-threshold ionization

Attosecond ionization time delays in strong-field physics

Classical and quantum theory of fluctuations for many‐particle systems out of equilibrium

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