Rostock 2019 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 40: Quantum Effects (QED) I
Q 40.3: Talk
Wednesday, March 13, 2019, 14:30–14:45, S Ex 04 E-Tech
Semi-classical limitations for photon emission in strong external fields — •Erez Raicher1, Shalom Eliezer2,3, Christoph H. Keitel1, and Karen Z. Hatsagortsyan1 — 1Max Planck Institute for nuclear physics, Heidelberg, Germany — 2Polytechnic University of Madrid, Madrid, Spain — 3Soreq nuclear research center, Yavne, Israel
The semi-classical heuristic emission formula of Baier-Katkov [Sov. Phys. JETP 26, 854 (1968)] is well-known to describe radiation of an ultrarelativistic electron in strong external fields employing the electron's classical trajectory. To find the limitations of the Baier-Katkov approach, we investigate electron radiation in a strong rotating electric field quantum mechanically using the Wentzel-Kramers-Brillouin approximation. Except for an ultrarelativistic velocity, it is shown that an additional condition is required in order to recover the widely used semi-classical result. A violation of this condition leads to two consequences. First, it gives rise to qualitative discrepancy in harmonic spectra between the two approaches. Second, the quantum harmonic spectra are determined not only by the classical trajectory but also by the dispersion relation of the effective photons of the external field.