Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magneto-optical Kerr effect and signature of the chiral anomaly in a
  Weyl semimetal in a magnetic field   One striking property of the Landau level spectrum of a Weyl semimetal (WSM)
is the existence of a chiral Landau level, in which the electrons propagate
unidirectionally along the magnetic field. This linearly dispersive level
influences the optical properties of WSMs. For example, it was recently shown
that a complete optical valley polarization is achievable in a time-reversal
symmetric Weyl semimetal placed in a magnetic field\cite% {Bertrand2019}. This
effect originates from inter-Landau level transitions involving the chiral
Landau level and requires a tilt of the Weyl cones. In this paper, we show how
the magneto-optical Kerr effect (MOKE) is modified in a WSM\ with tilted Weyl
cones in comparison with its behavior in a normal metal and how a valley
polarization can be detected using MOKE. We study both the Faraday
(longitudinal) and Voigt (transverse) configurations for light incident on a
semi-infinite WSM surface with no Fermi arcs. We use a minimal model of a WSM
with four tilted Weyl nodes related by mirror and time-reversal symmetry. In
the Voigt configuration, a large peak of the Kerr angle occurs at the plasmon
frequency. We show that the blueshift in frequency of this peak with increasing
magnetic field is a signature of the chiral anomaly in the MOKE.

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The categories of this paper are: hep-th
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: math