Volume 110, Number 5, June 2015
|Number of page(s)||6|
|Section||The Physics of Elementary Particles and Fields|
|Published online||18 June 2015|
Nonperturbative signatures in pair production for general elliptic polarization fields
1 Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University - Beijing 100875, China
2 Beijing Radiation Center - Beijing 100875, China
3 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences - Shanghai 201800, China
4 National Laboratory of Science and Technology on Computational Physics, Institute of Applied Physics and Computational Mathematics - Beijing 100088, China
Received: 17 April 2015
Accepted: 1 June 2015
The momentum signatures in nonperturbative multiphoton pair production for general elliptic polarization electric fields are investigated by employing the real-time Dirac-Heisenberg-Wigner formalism. For a linearly polarized electric field we find that the positions of the nodes in momentum spectra of created pairs depend only on the electric-field frequency. The polarization of external fields could not only change the node structures or even make the nodes disappear but also change the thresholds of pair production. The momentum signatures associated to the node positions in which the even-number photon pair creation process is forbidden could be used to distinguish the orbital angular momentum of created pairs on the momentum spectra. These distinguishable momentum signatures could be relevant for providing the output information of created particles and also the input information of ultrashort laser pulses.
PACS: 12.20.Ds – Specific calculations / 11.15.Tk – Other nonperturbative techniques / 32.80.-t – Photoionization and excitation
© EPLA, 2015
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