Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bulk-Fermi-Arc Transition Induced Large Photogalvanic Effect in Weyl
  Semimetals   The surface Fermi arc, as a hallmark of Weyl semimetals (WSMs), has been well
known in current research, but it remains a challenge to unveil novel phenomena
associated with the Fermi arc. Here, we predict a heretofore unrecognized
process in WSMs, namely, the photoinduced transition between the bulk states
and the Fermi arc. We find this process is significant and can lead to a large
effective three-dimensional shift current on the boundaries with the Fermi arc
in wide terahertz range. Moreover, due to the low symmetry of the boundaries,
the surface photogalvanic effect predicted here can appear in a large class of
WSMs that do not have bulk shift current. Hence, our work not only unveils a
hidden photogalvanic effect in WSMs but also suggests that all the WSMs are
promising material candidates for developing efficient terahertz
photodetectors.

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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga