Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lorentz Covariance of Dirac Electrons in Solids: Dielectric and
  Diamagnetic Properties   We study the electrodynamics of Dirac electrons in solids (e.g., bismuth) by
comparing it with quantum electrodynamics (QED). It is shown that Lorentz
covariance associated with the Dirac electrons in solids results in a
remarkable correlation between the dielectric and diamagnetic properties,
leading to a significant enhancement in the permittivity directly linked to the
well-known phenomenon of large diamagnetism.

25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
1
The categories of this paper are: cs