Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 42: Quantum Effects: QED II

Q 42.7: Vortrag

Mittwoch, 25. März 2015, 16:00–16:15, B/SR

Lifting Shell Structures in Periodic Electric Fields — •Andreas Otto^{1, 2}, Burkhard Kämpfer^{1, 2}, and Daniel Seipt³ — ¹Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany — ²Institut für Theoretische Physik, Technische Universität Dresden, Zellescher Weg 17, 01062 Dresden, Germany — ³Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany

We report on strong enhancement effects in the dynamically assisted Schwinger effect. Periodic electric fields produce electron-positron-pairs distributed in special structures in momentum space. Superposing two fields with different field strength/frequency scales (i.e. adding a fast but weak field to a slow but strong field), one can significantly increase the number of produced particles, achieving enhancement factors of O(10³)-O(10⁴). In the framework of a quantum kinetic equation, this enhancement can be understood by the distribution of the complex zeros of the canonical electron field energy.