Study of pair production in inhomogeneous two-color electric fields using the computational quantum field theory

TL;DR

This paper demonstrates the equivalence of computational quantum field theory and quantum kinetic theory for pair creation, verifies this numerically, and explores how various field parameters influence pair production in inhomogeneous two-color electric fields.

Contribution

It introduces a theoretical and numerical comparison between quantum field theory and kinetic theory, and investigates parameter effects on pair creation in complex electric fields.

Findings

Equivalence of computational quantum field theory and quantum kinetic theory for pair creation.

Sensitivity of pair production enhancement to field frequency, width, pulse duration, and phase.

Potential for optimizing pair creation through control of electric field parameters.

Abstract

We first demonstrate theoretically that the computational quantum field theory is equivalent to the quantum kinetic theory for pair creation in a spatially homogeneous and time-dependent electric field, then verify numerically their equivalence for pair creation in one-dimensional time-dependent electric fields, and finally investigate detailedly the effects of the field frequency, spatial width, pulse duration, and relative phase on dynamically assisted Schwinger pair production in an inhomogeneous two-color electric field. It is found that the enhancement effect of pair creation is very sensitive to the field frequency and generally very obvious for a shorter field width, a longer pulse duration, and a relative phase of maximizing the field strength. These results can provide a significant reference for the optimal control theory of pair creation which aims to maximize the created pair yield within a given scope of field parameters.