Odd-fold-symmetric spiral momentum distributions and their Stark distortions in hydrogen

Kong, Xuelian; Zhang, Guizhong; Li, Meng; Wang, Tianqing; Ding, Xin; Yao, Jianquan

doi:10.1364/josab.35.002163

Cited by 12 publications

(5 citation statements)

References 49 publications

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“…So far, the physical properties and ionization dynamics of free electron vortices created by tunneling ionization are still unexplored. Although vortices from non-perturbative MPI have been investigated both experimentally [1,2] and theoretically [10][11][12] the transition of photoelectron vortices from the ATI to the tunneling regime has not been examined. In Fig.…”

Section: Perspectivesmentioning

confidence: 99%

“…The use of counterrotating circularly polarized (CRCP) time-delayed attosecond pulses was proposed as an alternative way to generate vortex-shaped photoelectron wave packets in the photoionization of helium atoms [9]. Subsequent theoretical studies have refined our understanding of electron vortices by investigating photoionization with intense [10][11][12] and bichromatic [11,[13][14][15] fields, double ionization [16][17][18] and molecular photoionization [14,15,18,19]. Control of electron vortices by the carrier envelope phase (CEP) [14,20], the relative optical phase [17,21] and the polarization state [13,15,16,22,23] was discussed.…”

Section: Introductionmentioning

confidence: 99%

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Atomic photoionization dynamics in ultrashort cycloidal laser fields

Bayer,

Philipp,

Eickhoff

et al. 2020

Preprint

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We present numerical simulations of ultrafast multiphoton ionization dynamics in a twodimensional atomic model driven by co-and counterrotating circularly polarized single-color and bichromatic carrier envelope phase (CEP) stable ultrashort laser pulse sequences. Taking into account phase variations due to CEP fluctuations and the Gouy phase, our results accurately reproduce recently measured photoelectron momentum distributions [1][2][3][4]. The time evolution of the complexvalued electron wave function in coordinate and momentum space is calculated to study the bound state-and the vortex formation dynamics. The non-vanishing azimuthal probability current density proves the vortex nature of electron wave packets with odd-numbered rotational symmetry. Their angular momentum expectation value assumes half-integer values of 3.5 (corotating) and 0.5 (counterrotating). Knowledge of the wave function allows us to analyze the photoionization dynamics and to validate the physical pictures proposed in previous experimental studies. As an outlook, we investigate how electron vortices develop from the multiphoton-to the tunnel regime with increasing laser intensity.

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Section: Perspectivesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atomic photoionization dynamics in ultrashort cycloidal laser fields

Bayer,

Philipp,

Eickhoff

et al. 2020

Preprint

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“…Furthermore, many theoretical investigations have significantly enriched our understanding of electron vortex phenomena. These studies have delved into various aspects, including photoionization, double ionization [22], and molecular photoionization [17,[23][24][25] under the influence of intense [16,26,27] or bichromatic [13,17,23,26] laser fields. The generation of vortex-shaped photoelectron wave packets in the photoionization of helium atoms [13,28] and hydrogen molecular ions [29] has been proposed by employing timedelayed counter-rotating circularly polarized attosecond pulses.…”

Section: Introductionmentioning

confidence: 99%

Electron vortex generations in photoionization of hydrogen atoms by circularly-polarized chirped attosecond pulses

Zhang,

Liu,

Zhu

et al. 2024

Commun. Theor. Phys.

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By numerically solving the time-dependent Schrödinger equation and employing the analytical perturbative model, we investigate the chirp-induced electron vortex in the photoionization of hydrogen atoms by a pair of counter-rotating circularly polarized chirped attosecond XUV pulses. We demonstrate that single-photon ionization of hydrogen atoms generates photoelectron momentum distributions (PMDs) with distinct helical vortex structures either with or without a time delay between two counter-rotating circularly polarized laser pulses. These structures are highly sensitive to both the time delay between the pulses and their chirp parameters. Our analytical model reveals that the splitting of vortex spirals is caused by the sign changing of chirp-induced frequency-dependent time delay. We show that to obtain the counterpart of PMD under a pair of counter-rotating circularly polarized chirped pulses, both chirp parameters and ordering of pulses need to be reversed.

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“…Atomic FEVs have been studied theoretically employing different numerical methods, including the ab initio solution of the time-dependent Schrödinger equation (TDSE) ( Ngoko Djiokap et al 2015; Ngoko Djiokap et al, 2016 ; Djiokap and Starace., 2017 ; Ngoko Djiokap et al, 2017 ; Ivanov et al, 2017 ; Jia et al, 2019 ; Xiao et al, 2019 ; Bayer et al, 2020 ; Qin et al, 2020 ; Wang et al, 2020 ; Zhen et al, 2020 ; Geng et al, 2020 ; Maxwell et al, 2020 ; Djiokap et al, 2021 ; Geng et al, 2021 ), calculations based on the strong-field approximation ( Hasović et al, 2016 ; Ivanov et al, 2017 ; Li M. et al, 2017 ; Li et al, 2018a ; Li et al, 2018b ; Gazibegović-Busuladžić et al, 2018 ; Kong et al, 2018 ; Li et al, 2019b ; Xiao et al, 2019 ; Geng et al, 2020 ; Maxwell et al 2020 ; Qin et al, 2020 ; Geng et al, 2021 ; Becker and Milošević, 2022) , perturbative analytical approaches ( Ngoko Djiokap et al, 2015; Ngoko Djiokap et al, 2016 ; Djiokap and Starace, 2017 ; Ngoko Djiokap et al, 2017 ; Djiokap et al, 2021 ), emerging techniques such as the

-matrix with time-dependence theory ( Clarke et al, 2018 ; Armstrong et al, 2019 ; Maxwell et al, 2020 ) and semi-classical Monte-Carlo methods ( Ben et al, 2020) . Current research topics comprise the creation of FEVs with odd rotational symmetry using bichromatic pulse sequences ( Ngoko Djiokap et al, 2016) , the study of electron-electron correlations in atomic double-ionization ( Djiokap and Starace, 2017 ; Ngoko Djiokap et al, 2017 ), the influence of the AC-Stark effect on FEVs from strong-field ionization ( Kong et al, 2018 ; Li et al, 2019a) , the application of FEVs to probe electron displacement in strong-field ionization ( Xiao et al, 2019) , the detection of ring currents ( Wang et al, 2020) ...…”

Section: Introductionmentioning

confidence: 99%

Molecular Free Electron Vortices in Photoionization by Polarization-Tailored Ultrashort Laser Pulses

Bayer

Wollenhaupt

2022

Front. Chem.

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Atomic and molecular free electron vortices (FEVs), characterized by their spiral-shaped momentum distribution, have recently attracted a great deal of attention due to their varied shapes and their unusual topological properties. Shortly after their theoretical prediction by the single-photon ionization (SPI) of He atoms using pairs of counterrotating circularly polarized attosecond pulses, FEVs have been demonstrated experimentally by the multiphoton ionization (MPI) of alkali atoms using single-color and bichromatic circularly polarized femtosecond pulse sequences. Recently, we reported on the analysis of the experimental results employing a numerical model based on the ab initio solution of the time-dependent Schrödinger equation (TDSE) for a two-dimensional (2D) atom interacting with a polarization-shaped ultrashort laser field. Here, we apply the 2D TDSE model to study molecular FEVs created by SPI and MPI of a diatomic molecule using polarization-tailored single-color and bichromatic femtosecond pulse sequences. We investigate the influence of the coupled electron-nuclear dynamics on the vortex formation dynamics and discuss the effect of CEP- and rotational averaging on the photoelectron momentum distribution. By analyzing how the molecular structure and dynamics is imprinted in the photoelectron spirals, we explore the potential of molecular FEVs for ultrafast spectroscopy.

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Odd-fold-symmetric spiral momentum distributions and their Stark distortions in hydrogen

Cited by 12 publications

References 49 publications

Atomic photoionization dynamics in ultrashort cycloidal laser fields

Atomic photoionization dynamics in ultrashort cycloidal laser fields

Electron vortex generations in photoionization of hydrogen atoms by circularly-polarized chirped attosecond pulses

Molecular Free Electron Vortices in Photoionization by Polarization-Tailored Ultrashort Laser Pulses

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