Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Weyl hydrodynamics in a strong magnetic field   We study the hydrodynamic transport of electrons in a Weyl semimetal in a
strong magnetic field. Impurity scattering in a Weyl semimetal with two Weyl
nodes is strongly anisotropic as a function of the direction of the field and
is significantly suppressed if the field is perpendicular to the separation
between the nodes in momentum space. This allows for convenient access to the
hydrodynamic regime of transport, in which electron scattering is dominated by
interactions rather than by impurities. In a strong magnetic field, electrons
move predominantly parallel to the direction of the field, and the flow of the
electron liquid in a Weyl-semimetal junction resembles the Poiseuille flow of a
liquid in a pipe. We compute the viscosity of the Weyl liquid microscopically
and find that it weakly depends on the magnetic field and has the temperature
dependence $\eta(T)\propto T^2$. The hydrodynamic flow of the Weyl liquid can
be generated by a temperature gradient. The hydrodynamic regime in a
Weyl-semimetal junction can be probed via the thermal conductance
$G_q(B,T)\propto B^2 T$ of the junction.

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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int