Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High electrical conduction of Sb square net in anti-ThCr$_2$Si$_2$ type
  La$_2$O$_2$Sb thin film grown by multilayer solid-phase epitaxy   Anti-ThCr$_2$Si$_2$ type $RE_2$O$_2$Sb ($RE$ = rare earth) with Sb square net
has shown insulating conduction so far. Here we report the synthesis of
La$_2$O$_2$Sb epitaxial thin films for the first time by multilayer solid-phase
epitaxy. The valence state of Sb was about -2 evaluated from X-ray
photoemission spectroscopy measurement, and the indirect band gap of 0.17 eV
was observed. The La$_2$O$_2$Sb epitaxial thin film showed unexpectedly high
electrical conduction as a narrow gap semiconductor, whose resistivity at room
temperature was approximately ten-thousand-fold lower than that of
La$_2$O$_2$Sb bulk polycrystal, attributed to increased carrier mobility
probably due to suppressed Sb dimerization.

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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc