Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonreciprocal Directional Dichroism Induced by the Quantum Metric Dipole   We identify the quantum metric dipole as the geometric origin of the
nonreciprocal directional dichroism which describes the change in the
refractive index upon reversing the light propagation direction. Specifically,
we find that the static limit of the nonreciprocal directional dichroism
corresponds to a quadrupolar transport current from the quantum metric dipole,
in response to a quadrupolar electric field. Moreover, at finite frequency, we
demonstrate that the steepest slope of the averaged quantum metric dipole
determines a peak. Finally, we illustrate both features in a low-energy model.

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The categories of this paper are: patt-sol
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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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: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int