Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 37: Electron scattering and recombination
A 37.7: Vortrag
Donnerstag, 20. März 2014, 12:15–12:30, BEBEL E42
Interaction of relativistic electron vortex beams with few-cycle laser pulses — •Armen Hayrapetyan1,2, Oliver Matula1,3, Andrea Aiello2,4, Andrey Surzhykov5, and Stephan Fritzsche5,6 — 1Universität Heidelberg, 69120 Heidelberg, Germany — 2Max-Planck-Institut für die Physik des Lichts, 91058 Erlangen, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany — 4Universität Erlangen-Nürnberg, 91058 Erlangen, Germany — 5Helmholtz-Institut Jena, 07743 Jena, Germany — 6Universität Jena, 07743 Jena, Germany
We have studied the interaction of relativistic electron vortex beams (EVBs) with laser light. Exact analytical solutions for this problem are obtained by employing the Dirac-Volkov wave-functions to describe the (monoenergetic) distribution of the electrons in vortex beams with well-defined orbital angular momentum (OAM). Our new solutions explicitly show that the OAM components of the laser field couple to the total angular momentum of the electrons. When the field is switched off, it is shown that the laser-driven EVB coincides with the field-free EVB as reported by Bliokh et al. [Phys. Rev. Lett. 107, 174802 (2011)]. Moreover, we calculate the probability density for finding an electron in the beam profile and demonstrate that the center of the beam is shifted with respect to the center of the field-free EVB. This shift is unavoidably accompanied with an azimuthal dependence of the electronic probability density distribution and can be an important observable that manifests itself in the interaction of the twisted electrons with laser pulses.