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Effect of symmetrical frequency chirp on pair production |
| Kun Wang(王焜)1, Xuehua Hu(胡学华)1, Sayipjamal Dulat1,†, and Bai-Song Xie(谢柏松)2,3,‡ |
1 School of Physics and Technology, Xinjiang University, Urumqi 830046, China;
2 Key Laboratory of Beam Technology of the Ministry of Education, and College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;
3 Beijing Radiation Center, Beijing 100875, China |
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Abstract By using Dirac-Heisenberg-Wigner formalism we study electron-positron pair production for linear, elliptic, nearly circular, and circular polarizations of electric fields with symmetrical frequency chirp, and we obtain momentum spectra and pair yield. The difference of results among polarized fields is obvious for the small chirp. When the chirp parameter increases, the momentum spectra tend to exhibit the multiphoton pair generation that is characterized by the multi-concentric ring structure. The increase of the number density is also remarkable compared to the case of asymmetrical frequency chirp. Note that the dynamically assisted Schwinger mechanism plays an important role for the enhanced pair production in the symmetrical frequency chirp.
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Received: 31 December 2020
Revised: 23 February 2021
Accepted manuscript online: 16 March 2021
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PACS:
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02.60.-x
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(Numerical approximation and analysis)
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12.20.Ds
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(Specific calculations)
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03.65.Pm
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(Relativistic wave equations)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11875007, 11935008, and 11965020). |
Corresponding Authors:
Sayipjamal Dulat, Bai-Song Xie
E-mail: sdulat@msu.edu;bsxie@bnu.edu.cn
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Cite this article:
Kun Wang(王焜), Xuehua Hu(胡学华), Sayipjamal Dulat, and Bai-Song Xie(谢柏松) Effect of symmetrical frequency chirp on pair production 2021 Chin. Phys. B 30 060204
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