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Zeitschriftenartikel

Nonuniform Currents and Spins of Relativistic Electron Vortices in a Magnetic Field

MPG-Autoren
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Kruining,  Koen van
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Hayrapetyan,  Armen G.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

Volltexte (frei zugänglich)

LandaubeamsKvKv9.pdf
(beliebiger Volltext), 713KB

Ergänzendes Material (frei zugänglich)

supplement.pdf
(Ergänzendes Material), 108KB

Zitation

Kruining, K. v., Hayrapetyan, A. G., & Götte, J. B. (2017). Nonuniform Currents and Spins of Relativistic Electron Vortices in a Magnetic Field. Physical Review Letters, 119(3): 030401. doi:10.1103/PhysRevLett.119.030401.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-002D-D391-0
Zusammenfassung
We present a relativistic description of electron vortex beams in a homogeneous magnetic field. Including spin from the beginning reveals that spin-polarized electron vortex beams have 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. The well-defined phase structure of these beams is analogous to simpler scalar vortex beams, owing to the protection by the Zeeman effect. For states that do show spin-orbit mixing, the spin polarization across the beam is nonuniform rendering the spin and orbital degrees of freedom inherently inseparable.