中国物理B ›› 2021, Vol. 30 ›› Issue (6): 60204-060204.doi: 10.1088/1674-1056/abeee8
Kun Wang(王焜)1, Xuehua Hu(胡学华)1, Sayipjamal Dulat1,†, and Bai-Song Xie(谢柏松)2,3,‡
Kun Wang(王焜)1, Xuehua Hu(胡学华)1, Sayipjamal Dulat1,†, and Bai-Song Xie(谢柏松)2,3,‡
摘要: 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.
中图分类号: (Numerical approximation and analysis)