Franz-Keldysh effect in strong-field QED

Taya, Hidetoshi (Department of Physics and Center for Field Theory and Particle Physics, Fudan University, Shanghai 200433, China)

15 March 2019

Abstract: We studied a QED analog of the Franz-Keldysh effect, and the interplay between the nonperturbative (the Schwinger mechanism) and the perturbative particle production mechanism from the vacuum in the presence of a strong slow field superimposed by a weak field. We found that the Franz-Keldysh effect significantly affects the particle production: (i) the perturbative particle production occurs even below the threshold energy; (ii) the perturbative production becomes the most efficient just above the threshold energy; and (iii) an oscillating behavior appears in the production number above the threshold energy. These nontrivial changes are suppressed only weakly by powers of the critical field strength of QED. A relation to the dynamically assisted Schwinger mechanism and implications to experiments are also discussed.

Published in: Physical Review D 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevD.99.056006
arXiv: 1812.03630
License: CC-BY-4.0

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