Dynamics of an orbital polarization of twisted electron beams in electric and magnetic fields
1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2 Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna 141980, Russia
3 Research Institute for Nuclear Problems, Belarusian State University, Minsk 220030, Belarus
4 University of Chinese Academy of Sciences, Yuquanlu 19A, Beijing 100049, China
Published online: 3 April 2019
Relativistic classical and quantum dynamics of twisted (vortex) Dirac particles in arbitrary electric and magnetic fields is constructed. The relativistic Hamiltonian and equations of motion in the Foldy-Wouthuysen representation are derived. Methods for the extraction of an electron vortex beam with a given orbital polarization and for the manipulation of such a beam are developed. The new effect of a radiative orbital polarization of a twisted electron beam in a magnetic field resulting in a nonzero average projection of the intrinsic orbital angular momentum on the field direction is predicted.
© The Authors, published by EDP Sciences, 2019
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