Asymmetric pulse effects on pair production in chirped electric fields

We investigate the effects of the asymmetric pulse shapes on electron-positron pair production in three distinct fields: chirp-free, small frequency chirp, and large frequency chirp fields via the real-time Dirac-Heisenberg-Wigner formalism. Our findings reveal the disappearance of interference effe...

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Bibliographic Details
Published in:arXiv.org 2024-01
Main Authors: Chen, Neng-Zhi, Amat, Orkash, Li-Na, Hu, Hong-Hao, Fan, Bai-Song, Xie
Format: Article
Language:English
Subjects:
Asymmetry
Chirp
Density
Electric fields
Electron-positron pairs
Momentum
Pair production
Ring structures
Online Access:Get full text
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Summary:We investigate the effects of the asymmetric pulse shapes on electron-positron pair production in three distinct fields: chirp-free, small frequency chirp, and large frequency chirp fields via the real-time Dirac-Heisenberg-Wigner formalism. Our findings reveal the disappearance of interference effects with shorter falling pulse length, and the peak is concentrated on the left side of the momentum spectrum. As the falling pulse length extends, an incomplete multi-ring structure appears in the momentum spectrum. The number density of particles are very sensitive to the asymmetry of the pulse. With a long falling pulse, the number density can be significantly enhanced by over four orders of magnitude when certain frequency chirps are utilized. These results highlight the impact of the effective dynamically assisted mechanism and the frequency chirp on pair creation.
ISSN:2331-8422