Electron-positron pair production in a bifrequent oscillating electric field

Abstract

The production of electron-positron pairs from the quantum vacuum polarized by the superposition of a strong and a perturbative oscillating electric field mode is studied. Our outcomes rely on a nonequilibrium quantum field theoretical approach, described by the quantum kinetic BoltzmannVlasov equation. By superimposing the perturbative mode, the characteristic resonant effects and Rabi-like frequencies in the single-particle distribution function are modified, as compared to the predictions resulting from the case driven by a strong oscillating field mode only. This is demonstrated in the momentum spectra of the produced pairs. Moreover, the dependence of the total number of pairs on the intensity parameter of each mode is discussed and a strong enhancement found for large values of the relative Keldysh parameter.

Pulse shape effects on the electron-positron pair production in strong laser fields

“…In order to gain a better understanding of the features described above, we present the correspond- To our knowledge, the even peaks of a unit height have not been observed within the previous numerical studies. This can be explained by the charge-conjugation symmetry [14,22]. For p = 0 the electron-positron pair must have an odd C parity and, therefore, it can be produced only via an absorption of odd number of photons (the C parity of a single photon is also odd).…”

Assisted dynamical Schwinger effect: pair production in a pulsed bifrequent field

“…The enhancement of Schwinger type pair production by an assisting field has been considered already in references [7,[16][17][18][19][20][21][22][23][24], e.g., for (i) a constant field plus some pulse with or without subcycle structures [20];…”

Low-dimensional approach to pair production in an oscillating electric field: Application to bandgap graphene layers

“…Many of them rely on the theoretical framework of QED in unstable vacuum [41]. In the case of a spatially homogeneous but time dependent electric field E E E(t) = (0, E(t), 0), 4 such a framework allows us to undertake the problem either through the S-matrix formalism [35, 46-50, 63, 69] or from the transport theory point of view [19,[53][54][55][56][57][58][59][60]66]. Both formulations are equivalent and complement each other.…”

“…The corresponding electric fields, having micrometer extensions and femtosecond durations, reach the percent level of the critical field E c . To further increase the chance for an experimental realization of Schwinger PP, theoreticians have proposed to superimpose multiple laser beams [10], exploit the Lorentz boost inherent to relativistic particlelaser beam collisions [11][12][13] or enhance the rate by the aid of an assisting high-frequency (photon) field [14][15][16][17][18][19]. * New address: Theory Group, Deutsches Elektronen-Synchrotron DESY, Notkestr.…”