Dynamically assisted Schwinger pair production in differently polarized electric fields with the frequency chirping

TL;DR

This paper explores how frequency chirping and polarization affect electron-positron pair production in electric fields, revealing interference effects and optimal parameters for maximizing particle yield.

Contribution

It introduces a detailed analysis of the combined effects of frequency chirp and polarization on pair production, identifying optimal conditions for enhancement.

Findings

Frequency chirps cause strong interference effects in momentum distribution.

Number density can be enhanced by 2-3 orders with large frequency chirps.

Sensitivity to field polarization decreases as the chirp parameter increases.

Abstract

We investigate the enhanced dynamically assisted electron-positron pair production in differently polarized electric fields with frequency chirps within the real-time Dirac-Heisenberg-Wigner formalism. The combined influence of the chirp parameter and the field polarization on the momentum distribution and the total number density of the created pairs is studied in detail for one-color field as well as dynamically assisted two-color combined fields. The frequency chirps lead to strong interference effects and significantly enhanced the peak values in the momentum distribution. In the dynamically assisted case, the number density can be enhanced significantly over 2-3 orders when large frequency chirps are applied to both strong and weak fields. Furthermore, we observe that sensitivity of the number density to field polarization progressively diminishes as the chirp parameter increases, a trend that holds for both one-color field and the assisted two-color combined fields. From our analysis, we identify optimal chirp and polarization values that yield maximal enhancement in dynamically assisted fields in different settings. These results provide a valuable foundation for the optimal control of pair production, offering guidance for maximizing particle yield within a constrained set of field parameters.