Klein tunneling phenomenon with pair creation process

¹ Institute of Applied Physics and Computational Mathematics - Beijing 100088, China
² Graduate School, China Academy of Engineering Physics - Beijing 100088, China

^(a) lbfu@iapcm.ac.cn

Received: 5 December 2017
Accepted: 24 February 2018

Abstract

In this paper, we study the Klein tunneling phenomenon with electron-positron pair creation process. Pairs can be created from the vacuum by a supercritical single-well potential (for electrons). In the time region, the time-dependent growth pattern of the created pairs can be characterized by four distinct regimes which can be considered as four different statuses of the single well. We find that if positrons penetrate the single well by Klein tunneling in different statuses, the total number of the tunneling positrons will be different. If Klein tunneling begins at the initial stage of the first status i.e. when the sing well is empty, the tunneling process and the total number of tunneling positrons are similar to the traditional Klein tunneling case without considering the pair creation process. As the tunneling begins later, the total tunneling positron number increases. The number will finally settle to an asymptotic value when the tunneling begins later than the settling-down time t_s of the single well which has been defined in this paper.