Field induced phase transition in the few photon regime

TL;DR

This paper investigates the field-induced phase transition and electron-positron plasma creation in strong, time-dependent electric fields, focusing on the few photon regime where the photon energy is comparable to the electron mass, revealing increased production efficiency.

Contribution

It extends previous work on vacuum electron-positron plasma creation by analyzing the few photon regime where photon energy is comparable to electron mass, highlighting enhanced production effects.

Findings

Narrowing of the transient oscillation domain

Significant increase in electron-positron plasma production efficiency

Enhanced effects in bifrequent excitation scenarios

Abstract

Some features of the field induced phase transition accompanied by the vacuum creation of an electron-positron plasma (EPP) in strong time-dependent electric fields have been discussed in the work [1] in the domain of the tunneling mechanism ($\omega \ll m$, where $\omega$ is the characteristic frequency of the external field and $m$ is the electron mass). In the present contribution the features of the this process will be considered in the few photon domain where $\omega \sim m$. We observe a narrowing of the transient domain of the fast oscillations and, mainly, a considerable growth of the effectiveness of the EPP production. Under these circumstances, we see an increase of the effectiveness of the EPP creation in the particular case of a bifrequent excitation, where both mechanisms (tunneling and few photon) act simultaneously [2,3].