Electron vortices in the central field

doi:10.3969/j.issn.1000-5641.2023.04.016

Abstract

Abstract:

Electron vortex beams were first discovered in systems that have a conservable orbital angular momentum; for systems where orbital angular momentum is not conserved, the existence of the electron vortices is uncertain. This article takes the electrons in the central field as examples and, in case of relativity, constructs a case where the orbital angular momentum is not conserved while the total angular momentum is conserved. When the electrons that carry a fixed total angular momentum propagate along the z-axis, the perturbation solution of the electron vortex beams corresponding to the system at this time is calculated and combined with the Foldy-Wouthuysen (F-W) transformation. Accordingly, we can prove, in the case of relativity central field, that the vortex solution does exist when the electrons with orbital angular momentum propagate along the z-axis. Consequently, the corresponding vortex wave solution and spiral isophase surface are shown in this article.

Key words: relativistic electron vortices, central field, Foldy-Wouthuysen (F-W) transformation, orbital angular momentum

CLC Number:

O412

Yongxiang ZHOU, Xun XUE. Electron vortices in the central field[J]. Journal of East China Normal University(Natural Science), 2023, 2023(4): 151-163.

Figures/Tables 5

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