Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: General quantum-mechanical solution for twisted electrons in a uniform
  magnetic field   A theory of twisted (and other structured) paraxial electrons in a uniform
magnetic field is developed. The obtained general quantum-mechanical solution
of the relativistic paraxial equation contains the commonly accepted result as
a specific case of unstructured electron waves. In the weak-field limit, our
solution (unlike the existing theory) is consistent with the well-known
equation for free twisted electron beams. The observable effect of a different
behavior of relativistic Laguerre-Gauss beams with opposite directions of the
orbital angular momentum penetrating from the free space into a magnetic field
is predicted. Distinguishing features of the quantization of the velocity and
the effective mass of structured electrons in the uniform magnetic field are
analyzed.

36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc