Enhancement of pair creation due to locality in bound-continuum interactions

Abstract

Electron-positron pair production from vacuum is studied in combined background fields, a binding electric potential well and a laser field. The production process is triggered by the interactions between the bound states in the potential well and the continuum states in the Dirac sea. By tuning the binding potential well, the pair production can be strongly affected by the locality of the bound states. The narrower bound states in position space are more efficient for pair production. This is in contrast to what is commonly expected that the wider extended bound states have larger region to interact with external fields and would thus create more particles. This surprise can be explained as the more localized bound states have a much wider extension in the momentum space, which can enhance the bound-continuum interactions in the creation process. This enhancement manifests itself in both perturbative and non-perturbative production regimes.

Creation mechanism of electron–positron pair on equally spaced multiple localized fields

“…Moreover, various methods are widely utilized in this field, such as the worldline instantons technique, [8][9][10][11][12] quantum kinetic theory, which includes the quantum Vlasov equation (QVE) [13][14][15][16][17][18][19] and realtime Dirac-Heisenberg-Wigner (DHW) formalism, [20][21][22][23][24][25][26][27] as well as computational quantum field theory (CQFT). [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] Recently, the relation between these methods has been explored. Dumlu [47] proved that the QVE is equivalent to the semiclassical scattering method in both scalar QED and spinor QED.…”

Enhancement of electron–positron pairs in combined potential wells with linear chirp frequency

“…[28] For a static Sauter potential well, though the bound state promotes the generation of electronpositron pairs, the inhibitory effect of Pauli blocking cannot be ignored. [40,42] On the contrary, Pauli blocking has a weak effect on the creation of electron-positron pairs in an oscillating potential well. [27] Furthermore, multiphoton processes are highly depends on the oscillating frequency.…”

Enhancement of electron-positron pairs in combined potential wells with linear chirp frequency

“…The number of created electrons in the symmetric potential is more than that in the asymmetric potential due to the two edges of the potential well [23]. In a static sauter potential well, although the bound state promotes the generation of electron-positron pairs, the inhibitory effect of Pauli blocking cannot be ignored [35,37].…”