Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 35: Quantum effects: QED I
Q 35.5: Vortrag
Donnerstag, 20. März 2014, 11:45–12:00, DO26 208
Assisted Multiphoton Pair Production in Periodic Fields — •Andreas Otto1,2, Daniel Seipt3,1, Hans Oppitz1,2, and Burkhard Kämpfer1,2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden — 2Institut für Theoretische Physik, Technische Universität Dresden, Zellescher Weg 17, 01062 Dresden — 3Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena
Strong time dependent, spatially homogeneous electric fields can produce electron-positron pairs through tunnelling and multiphoton processes, the so called dynamical Schwinger effect. This production rate can be greatly enhanced by combining two fields of different timescales and strengths. In the framework of a quantum kinetic equation we investigate the superposition of two periodic fields and show that, by suitable choice of parameters, one can achieve enhancement factors O(103)-O(104) relative to the yields of the individual fields. We identify the strong non-linear enhancement as a result of the mutual field assistance resulting in special phase space structures. Their time dependence allows for a physical explanation of the enhancement in dynamically assisted Schwinger pair production in periodic fields.