Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atomic scale electron vortices for nanoresearch   Electron vortex beams were only recently discovered and their potential as a
probe for magnetism in materials was shown. Here we demonstrate a new method to
produce electron vortex beams with a diameter of less than 1.2 \AA. This unique
way to prepare free electrons to a state resembling atomic orbitals is
fascinating from a fundamental physics point of view and opens the road for
magnetic mapping with atomic resolution in an electron microscope.

31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph