Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Purely electronic THz polarization in dimer Mott insulators   We theoretically discover purely electronic polarization modes in THz
frequency region in dimer Mott insulators $\kappa$-(BEDT-TTF)$_2$X. The unusual
low-frequency modes arise from the coupling between the oscillation of
intradimer electric dipole moments and that of alternating interdimer bond
orders. These collective motions play an important role in the dynamical
dielectric properties of the dimer Mott insulators. Near the phase boundary of
the dimer Mott transition, the ferroelectric ground state is realized by
introducing electron-lattice coupling.

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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: physics
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The categories of this paper are: stat
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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: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph