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

Abstract

The effect of linear chirp frequency on the process of electron-positron pairs production from vacuum in the combined potential wells is investigated by computational quantum field theory. Numerical results of electron number and energy spectrum under different frequency modulation parameters are obtained. By comparing with the fixed frequency, it is found that frequency modulation has a significant enhancement effect on the number of electrons. Especially when the frequency is small, appropriate frequency modulation enhances multiphoton processes in pair creation, thus promoting the pair creation. However, the number of electrons created by high frequency oscillating combined potential wells decreases after frequency modulation due to the phenomenon of high frequency suppression. The contours of the number of electrons varying with frequency and frequency modulation parameters are given, which may provide theoretical reference for possible experiments.

Advances in QED with intense background fields

“…Such "perturbative" enhancement becomes significant due to resonance when fields contain threshold frequencies such that 2m/ω ∈ N [689,690,685,127,691,692]. This is important for pulse shaping to maximise the Schwinger effect for experiments (see also the dynamically assisted Schwinger effect discussed next) [693,694,690,695,696,697,698,699,700,701,702].…”

Advances in QED with intense background fields

“…Such ''perturbative'' enhancement becomes significant due to resonance when fields contain threshold frequencies such that 2m/ω ∈ N [135,698,[702][703][704][705]. This is important for pulse shaping to maximise the Schwinger effect for experiments (see also the dynamically assisted Schwinger effect discussed next) [703,[706][707][708][709][710][711][712][713][714][715].…”

Schwinger pair production rate and time for some space-dependent electromagnetic fields via worldline instantons formalism

“…In recent years, many studies on Sauter-Schwinger effect has been investigated by different methods. The current widely used methods include the real time Dirac-Heisenberg-Wigner (DHW) formalism [15][16][17][18][19][20][21][22][23], the computational quantum field theory (CQFT) [24][25][26][27][28], the quantum Vlasov equation (QVE) [29][30][31][32][33], the Wentzel-Kramers-Brillouin (WKB) approach [34][35][36][37][38][39][40], the worldline instanton technique [41][42][43][44][45][46][47][48][49][50][51][52][53][54] and so on. However, most of these studies do not have analytical solutions and explanations, and most of the results of the vacuum pair productions caused by the external electromagnetic field are waiting for the analytical solutions and interpretations.…”