Electron-positron pair production in an oscillating Sauter potential

Abstract

Electron-positron pair production in an oscillating Sauter potential is investigated in the framework of the computational quantum field theory. It is found that for a Sauter potential well with oscillating width and depth simultaneously, the phase difference between them has a great impact on the number of created electron-positron pairs. Optimal values of the phase difference corresponding to different oscillation frequencies are obtained. The optimal phase difference has a strong nonlinear dependence on oscillating frequency. When the potential well changes slowly, our results can be explained by the instantaneous bound states. For the higher frequency case, however, multiphoton effect is enhanced and the Pauli blocking effect has a strong inhibitory effect on pair creations. These results can provide a theoretical reference for the experimental creation of the electron-positron pairs.

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

“…[26][27][28][29] By combining a strong and constant field with a weaker and high frequency oscillating field, electron-positrons pairs can be created through the dynamically assisted Sauter-Schwinger effect, where the paircreation probability is strongly enhanced. [30][31][32][33][34][35][36][37][38] In order to lower the threshold of pair creation, many facilities have been proposed, such as multiple well-barrier structures, [39] the symmetric potential well, [28] oscillating Sauter potential, [40] and asymmetric Sauter potential well. [41] 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.…”

“…[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.…”

Phase effect and symmetry on pair production in spatially inhomogeneous frequency chirping electric fields

“…. The momentum spectrum and number density of created particles are examined analytically or/and numerically under both spatially homogeneous [18,19,[26][27][28][29][30][31][32][33][34][35][36] as well as inhomogeneous electromagnetic fields [20-23, 25, 37-39] with many different field shapes. Recently, Fedotov et al have reviewed and summarized the key theories and progress in strong field QED in the past decade [40].…”

“…In particular, pair production process has significant dependence on the CEP which is the phase difference between carrier wave and envelop of the pulse profile [41,42]. Many investigations have been performed and the different nonlinear features of vacuum decay are observed for various oscillating forms of external fields [19,23,33,35,37,[42][43][44]. Nevertheless, to our knowledge, most of them are merely concentrated on the role of CEP in time dependent background fields except Refs.…”

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

“…Nowadays, physicists commonly believe that by choosing the appropriate field configurations both in space-and timedomains one can amplify the pair production [18,19]. A wellknown procedure is to employ the bound states [20][21][22][23][24][25] in * qingzheng.lyu@mpi-hd.mpg.de some binding potentials as the bridge between the positive and negative energy states to enhance pair production. This can be realized in laboratory by shooting a laser at a highly charged ion or nucleus.…”