Journal
PHYSICS LETTERS B
Volume 766, Issue -, Pages 71-76Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2016.12.056
Keywords
Electron-positron pair production; Short laser pulses; Quantum interference
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Photoproduction of electron-positron pairs by the strong-field Breit-Wheeler process in an intense laser field is studied. The laser field is assumed to consist of two consecutive short pulses, with a variable time delay in between. By numerical calculations within the framework of scalar quantum electrodynamics, we demonstrate that the time delay exerts a strong impact on the pair-creation probability. For the case when both pulses are identical, the effect is traced back to the relative quantum phase of the interfering S-matrix amplitudes and explained within a simplified analytical model. Conversely, when the two laser pulses differ from each other, the pair-creation probability depends not only on the time delay but, in general, also on the temporal order of the pulses. (C) 2017 The Authors. Published by Elsevier B.V.
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