Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological Inverse Faraday Effect in Weyl Semimetals   We demonstrate that in Weyl semimetals, the momentum-space helical spin
texture can couple to the chirality of the Weyl node to generate a
frequency-independent magnetization in response to circularly polarized light
through the inverse Faraday effect. This frequency-independence is rooted in
the topology of the Weyl node. Since the helicity and the chirality are always
locked for Weyl nodes, this effect is not subject to any symmetry constraint.
Finally, we show that the photoinduced frequency-independent magnetization is
robust against lattice effect and has a magnitude large enough to realize
ultrafast all-optical magnetization switching below picosecond.

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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th