Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Band gap tuning in ferroelectric Bi4Ti3O12 by alloying LaTMO3 (TM = Ti,
  V, Cr, Mn, Co, Ni, and Al)   We fabricated ferroelectric Bi4Ti3O12 (BiT) single crystalline thin films
site-specifically substituted with LaTMO3 (TM = Al, Ti, V, Cr, Mn, Co, and Ni)
on SrTiO3 substrates by pulsed laser epitaxy. When transition metals are
incorporated into a certain site of the BiT, some of BiT-LaTMO3 showed a
substantially decreased band gap, coming from the additional optical transition
between oxygen 2p and TM 3d states. Specifically, all alloys with Mott
insulators revealed a possibility of band gap reduction. Among them, BiT-LaCoO3
showed the largest band gap reduction by ~1 eV, positioning itself as a
promising material for highly efficient opto-electronic devices.

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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph