Quantum 2025 – wissenschaftliches Programm
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TUE: Tuesday Contributed Sessions
TUE 9: Quantum Physics in Strong Fields: Contributed Session to Symposium
TUE 9.7: Vortrag
Dienstag, 9. September 2025, 15:45–16:00, ZHG101
Vortex Structures and Spin Effects in Dynamical Schwinger Process — •Wojciech Smialek1, Mateusz Majczak1, Adam Bechler1, Jerzy Kamiński1, Carsten Müller2, and Katarzyna Krajewska1 — 1Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Poland — 2Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, Germany
The dynamical Schwinger effect offers a unique opportunity to probe the nonperturbative regime of QFT under controlled conditions. While the spectra and yields of particles created in this process have been studied in great detail, the currently dominant tools for nonperturbative analysis of this process within QED do not allow for a full examination of the spin properties of the created pairs.
In order to study the angular momentum effects in the dynamical Schwinger process, we present a novel S-matrix-based formalism that grants access to the full information about the state of the created pairs through spin-resolved probability amplitudes. This formalism has been adapted to Dirac and Klein-Gordon fields to provide further insight into spin effects.
Our numerical analysis reveals the occurrence of vortical phase singularities in the complex probability amplitude of spinor and scalar pairs when the QED vacuum is exposed to a circularly polarized electric field. The occurrence of phase vortices is linked to a nonvanishing orbital angular momentum carried by the particles, and as we show, the structure of vortices for fermionic and bosonic pairs complies with the principle of angular momentum conservation.
Keywords: Schwinger effect; Strong field QED; Electron vortices; Spin