Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalized Design Principles for Hydrodynamic Electron Transport in
  Anisotropic Metals   Interactions of charge carriers with lattice vibrations, or phonons, play a
critical role in unconventional electronic transport of metals and semimetals.
Recent observations of phonon-mediated collective electron flow in bulk
semimetals, termed electron hydrodynamics, present new opportunities in the
search for strong electron-electron interactions in high carrier density
materials. Here we present the general transport signatures of such a
second-order scattering mechanism, along with analytical limits at the
Eliashberg level of theory. We study electronic transport, using $ab$ $initio$
calculations, in finite-size channels of semimetallic ZrSiS and TaAs$_2$ with
and without topological band crossings, respectively. The order of magnitude
separation between momentum-relaxing and momentum-conserving scattering
length-scales across a wide temperature range make both of them promising
candidates for further experimental observation of electron hydrodynamics. More
generally, our calculations show that the hydrodynamic transport regime can be
realized in a much broader class of anisotropic metals and does not, to first
order, rely on the topological nature of the bands. Finally, we discuss general
design principles guiding future search for hydrodynamic candidates, based on
the analytical formulation and our $ab$ $initio$ predictions. We find that
systems with strong electron-phonon interactions, reduced electronic phase
space, and suppressed phonon-phonon scattering at temperatures of interest are
likely to feature hydrodynamic electron transport. We predict that layered
and/or anisotropic semimetals composed of half-filled $d$-shells and light
group V/VI elements with lower crystal symmetry are ideal candidates to observe
hydrodynamic phenomena in future.

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The categories of this paper are: cs
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The categories of this paper are: math
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The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int