Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical density and spin response of Fermi arcs and their consequences
  for Weyl semimetals   Weyl semimetals exhibit exotic Fermi-arc surface states, which strongly
affect their electromagnetic properties. We derive analytical expressions for
all components of the composite density-spin response tensor for the surfaces
states of a Weyl-semimetal model obtained by closing the band gap in a
topological insulating state and introducing a time-reversal-symmetry-breaking
term. Based on the results, we discuss the electromagnetic susceptibilities,
the current response, and other physical effects arising from the density-spin
response. We find a magnetoelectric effect caused solely by the Fermi arcs. We
also discuss the effect of electron-electron interactions within the random
phase approximation and investigate the dispersion of surface plasmons formed
by Fermi-arc states. Our work is useful for understanding the electromagnetic
and optical properties of the Fermi arcs.

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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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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: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio