Dynamically assisted pair production for various polarizations

Olugh, Obulkasim; Li, Z.L.; Xie, Bai-Song

doi:10.1016/j.physletb.2020.135259

Cited by 18 publications

(11 citation statements)

References 32 publications

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“…We have examined Ref. [34,36] and meanwhile expanded the dynamically assisted field results in the sense of having chirping that the total yield of produced pair is indeed enhanced significantly in some cases by appropriate chirp parameters. However, our studies here exhibit very delicate and subtle effects about the chirping and the field forms on the pair production problem.…”

Section: Discussionmentioning

confidence: 99%

“…Schützhold et al [33] proposed dynamically assisted Schwinger mechanism, which is the combination of a low frequency strong field and high frequency weak field, and pointed out that the pair creation rate is enhanced extremely by the combined effect. Therefore, many different combinational field have been studied to enhance the e + e − pair production [34][35][36]. Especially, the enhanced pair production in time dependent one-and two-color laser fields by chirping have also been researched [20].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced dynamically assisted pair production in spatial inhomogeneous electric fields with the frequency chirping

Li,

Mohamedsedik,

Xie

2021

Preprint

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Chirped dynamically assisted pair production in spatial inhomogeneous electric fields is studied by the Dirac-Heisenberg-Wigner formalism. The effects of the chirp parameter on the reduced momentum spectrum, the reduced total yield of the created pairs for either low or high frequency one-color field and twocolor dynamically assisted combinational fields are investigated in detail. Also, the enhancement factor is obtained in the later two-color field case. It is found that for the low frequency field, no matter whether it is accompanied by the other high frequency field, its chirping has a little effect on the pair production.For the one-color high frequency field or/and two-color fields, the momentum spectrum exhibits incomplete interference and the interference effect becomes more and more remarkable as chirp increases. We also find that in the chirped dynamically assisted field, the reduced total yield is enhanced significantly when the chirps are acting on the two fields, compared with that the chirp is acting only for the low frequency strong field. Specifically, by the chirping, it is found the reduced pair number is increased by more than one order of magnitude in the field with a relative narrow spatial scale, while it is enhanced at least two times in other case of field with larger spatial scales or even in the quasi-homogeneous region. We also obtain some optimal chirp parameters and spatial scales for the total yield and enhancement factor in different scenarios of the studied external field. These results may provide a theoretical basis for possible experiments in the future.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced dynamically assisted pair production in spatial inhomogeneous electric fields with the frequency chirping

Li,

Mohamedsedik,

Xie

2021

Preprint

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“…In general, most pairs are expected to appear at those times corresponding to the local maxima of the field. Then those produced pairs are subject to acceleration by the electric field, and the gained momenta are [32]…”

Section: Linear Polarization δ =mentioning

confidence: 99%

“…We reveal some novel features of the momentum spectra of created pairs for differently polarized electric fields. In this study the real-time DHW formalism is employed as it leads to efficient calculations in the case of a circularly [28][29][30] or elliptically polarized electric field [31,32] .…”

Section: Introductionmentioning

confidence: 99%

Asymmetric pulse effects on pair production in polarized electric fields

Olugh

Xie

2020

High Pow Laser Sci Eng

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Using the Dirac–Heisenberg–Wigner formalism, effects of the asymmetric pulse shape on the generation of electron-positron pairs in three typical polarized fields, i.e., linear, middle elliptical and circular fields, are investigated. Two kinds of asymmetries for the falling pulse length, short and elongated, are studied. We find that the interference effect disappears with the shorter pulse length and that the peak value of the momentum spectrum is concentrated in the center of the momentum space. In the case of the extending falling pulse length, a multiring structure without interference appears in the momentum spectrum. Research results show that the momentum spectrum is very sensitive to the asymmetry of the pulse as well as to the polarization of the fields. We also find that the number density of electron-positron pairs under different polarizations is sensitive to the asymmetry of the electric field. For the short falling pulse, the number density can be significantly enhanced by over two orders of magnitude. These results could be useful in planning high-power and/or high-intensity laser experiments.

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“…The DHW method was developed from the fermion density operator to explore the phase space structure of the Dirac vacuum [22], and it is an efficient formalism for the investigations on pair creation under both spatially homogeneous [20,[28][29][30][31] as well as inhomogeneous electromagnetic fields [23][24][25]27]. In this paper, the DHW equations of motion are solved numerically [25,32] for spatially inhomogeneous external field modes given in Eq.…”

Section: B Dhw Formalismmentioning

confidence: 99%

Chirp effects on pair production in oscillating electric fields with spatial inhomogeneity

Ababekri,

Dulat,

Xie

et al. 2019

Preprint

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Dirac-Heisenberg-Wigner formalism is used to study chirp effects on the vacuum pair creation under inhomogeneous electric fields. For rapidly oscillating electric fields, the particle momentum spectrum is sensitive to both of the spatial scale and the chirp parameter, and the external field width has less significant effect for the maximally large chirp. For slowly oscillating electric fields, chirp effects could be identified at large spatial extents and the carrier phase plays a significant role reflecting chirp effects even at small spatial scales. We also notice that, the local density approximation holds for all external field profiles considered in this work at the quasihomogeneous limit allowing one to use arguments from homogeneous scenarios to analyze inhomogeneous results.

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Dynamically assisted pair production for various polarizations

Cited by 18 publications

References 32 publications

Enhanced dynamically assisted pair production in spatial inhomogeneous electric fields with the frequency chirping

Enhanced dynamically assisted pair production in spatial inhomogeneous electric fields with the frequency chirping

Asymmetric pulse effects on pair production in polarized electric fields

Chirp effects on pair production in oscillating electric fields with spatial inhomogeneity

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