Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: In-plane anisotropy of the electronic structure for the
  charge/orbital-ordered state in half-doped manganite with layered structure   We report on the in-plane anisotropy of the electronic response in the
spin/charge/orbital ordered phase of a half-doped layered-structure manganite.
The optical conductivity spectra for a single domain of Eu$_{1/2}$%
Ca$_{3/2}$MnO$_{4}$ unambiguously show the anisotropic charge dynamics which
well corresponds to the theoretical calculation: the optical conductivity with
the polarization along the zigzag ferromagnetic chain direction exhibits a
smaller gap and a larger intensity at lower energies than that of the
perpendicular polarization mostly due to the charge/orbital ordering and the
associated quantum interference effect.

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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph