arXiv 2007.032992020-07-07physics.atom-phquant-ph

非对称脉冲对极化电场中电子对产生的影响

Asymmetric pulse effects on pair production in polarized electric fields

Obulkasim Olugh, Zi-Liang Li, Bai-Song Xie

备注：: 17 pages, 8 figures

摘要：

使用Dirac-Heisenberg-Wigner（DHW）形式主义，e？在三种典型的极化场中，即，研究了直线型、中椭圆型和圆型等三种情况。研究了下降脉冲长度的两种不对称性，一种是压缩的，另一种是拉长的。它被发现，干扰e？随着脉冲长度的压缩，ECT消失，最终动量谱的峰值集中在动量空间的中心。对于相反的情况，通过延长下降脉冲的长度，在动量谱中出现了一个没有干涉的多环结构。研究结果表明，动量谱对脉冲的不对称性和场的偏振性非常敏感。研究还发现，在di？电流极化对电场的不对称性很敏感。对于压缩的下降脉冲，数密度可以显著提高超过2个数量级。这些结果可用于规划高功率或/和高强度激光实验。

英文摘要：

Using the Dirac-Heisenberg-Wigner (DHW) formalism, e?ects of asymmetric pulse shape on the generation of electron-positron pairs in three typical polarized fields, i.e., the linear, middle elliptical and circular ones, are investigated. Two kinds of asymmetries for the falling pulse length, one is compressed and the other is elongated, are studied. It is found that the interference e?ect disappears with the compression of the pulse length, and finally the peak value of the momentum spectrum is concentrated in the center of the momentum space. For the opposite situation by extending the falling pulse length, a multi-ring structure without interference appears in the momentum spectrum. Research results exhibit that the momentum spectrum is very sensitive to the asymmetry of the pulse as well as to the polarization of the fields. It is also found that the number density of electron-positron pairs under di?erent polarizations is sensitive to the asymmetry of electric field. For the compressed falling pulse, the number density can be enhanced significantly over 2 orders of magnitude. These results could be useful in planning high power or/and high-intensity laser experiments.

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摘要：

英文摘要：

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