Abstract
Scalar and fermionic particle pair production in rotating electric fields is investigated in the nonperturbative multiphoton regime. Angular momentum distribution functions in above-threshold pair production processes are calculated numerically within quantum kinetic theory and discussed on the basis of a photon absorption model. The particle spectra can be understood if the spin states of the particle-antiparticle pair are taken into account.
Highlights
Photoelectron angular distributions (PAD) are well known in chemistry and atom physics, where the focus is on studying ionization spectra and understanding the inner structure of molecules and atoms [1]
Viewing multiphoton pair production as the highly relativistic analog of the ionization of hydrogen, we can expand the concept of angular momentum transfer via photon absorption to the strong-field QED regime
A partial wave analysis, has been performed only in atomic physics, where it has proven its importance towards understanding molecular structures and the ionization process in general in various ways
Summary
Photoelectron angular distributions (PAD) are well known in chemistry and atom physics, where the focus is on studying ionization spectra and understanding the inner structure of molecules and atoms [1]. Viewing multiphoton pair production as the highly relativistic analog of the ionization of hydrogen, we can expand the concept of angular momentum transfer via photon absorption to the strong-field QED regime. The particle under consideration absorbs more photons than necessary in order to transit to a continuous state, which manifests in a series of peaks in the momentum spectrum In both scenarios, the peak positions are determined by the number of absorbed photons and the field-dependent threshold [4,5,6,7]. We have investigated multiphoton pair production with focus on the angular dependence of the particle distribution. In this article we only consider simple, time-dependent, rotating electric fields [24,25,26] Such configurations provide the perfect setting for testing our absorption model. Throughout this paper, we use natural units ħ 1⁄4 c 1⁄4 1 and measure all dimensionful quantities in terms of the mass of the particles m
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