Dynamically assisted pair production for various polarizations
| Autor: | Bai-Song Xie, Obulkasim Olugh, Zi-Liang Li |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Nuclear and High Energy Physics Number density 010308 nuclear & particles physics Strong field Polarization (waves) 01 natural sciences lcsh:QC1-999 Computational physics Nonlinear system Pair production Harmonics Electric field 0103 physical sciences 010306 general physics Circular polarization lcsh:Physics |
| Zdroj: | Physics Letters Physics Letters B, Vol 802, Iss, Pp-(2020) |
| Popis: | Electron-positron pair production in dynamically assisted two-color electric fields is investigated for various polarizations. Momentum spectrum and number density of the created pairs are examined carefully, in particular, the effects of polarization and high harmonics of two-color fields are exhibited. For only single strong field, the interference effects of momentum spectrum would be vanished when polarization is high, however, for the dynamical assisted two-color fields, the interference effects would be more and more remarkable with polarization. The multiple peaks of momentum spectrum in elliptic or/and circular polarization are observed and explained. It is found that there exists a strong nonlinear dependence of the number density on the high harmonics of two-color fields. Specially the number density can be enhanced significantly over 7−8 orders when appropriate high harmonics is present. Another interesting finding is that the polarization effect on number density is gradually weakened as the high harmonics increases, however, a weak nonlinearity relation appears again if the high harmonics exceeds a single-photon threshold. |
| Databáze: | OpenAIRE |
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