Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transport Currents and Persistent Currents in Solids: Orbital Magnetism
  and Hall Effect of Dirac Electrons   Features of electronic currents in solids are truly diverse depending on
circumstances, e.g. non-equilibrium transport currents leading to dissipation
and persistent currents flowing in equilibrium. Differences between these
currents may be clear in many cases, while there are some where they are not.
Results of theoretical studies on the latter cases will be introduced briefly
focusing on the inter-band effects of magnetic fields in orbital magnetisms and
Hall effects of Dirac electrons.

31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph