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Q: Fachverband Quantenoptik und Photonik
Q 50: Matter Wave Optics
Q 50.6: Talk
Thursday, March 9, 2017, 15:45–16:00, P 11
Relativistic electron vortex beams in a magnetic field — •Koen van Kruining1, Armen Hayrapetyan1, and Jörg Götte2 — 1Max-Planck-Institut für Physik komplexer Systeme, Dresden — 2College of Engineering and Applied Sciences, Nanjing University, Nanjing, China
We present a relativistic description of electron vortex beams in a constant magnetic field. Including spin from the beginning reveals a complicated azimuthal current structure, containing small rings of counterrotating current between rings of stronger corotating current. Contrary to many other problems in relativistic quantum mechanics, there exists a set of vortex beams with exactly zero spin-orbit mixing in the highly relativistic and nonparaxial regime. These 'clean' vortex beams possess no azimuthal currents and factorise in an azimuthal phase factor, or vortex charge, and a radial profile. A separation which is typically impossible for nonparaxial vortex beams of any nonzero spin.