Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic
  State in 5$d$ Transition Metal Oxides Sr$_{n+1}$Ir$_{n}$O$_{3n+1}$ ($n$=1, 2,
  and $\infty$)   We investigated the electronic structures of the 5$d$ Ruddlesden-Popper
series Sr$_{n+1}$Ir$_{n}$O$_{3n+1}$ ($n$=1, 2, and $\infty$) using optical
spectroscopy and first-principles calculations. As 5$d$ orbitals are spatially
more extended than 3$d$ or 4$d$ orbitals, it has been widely accepted that
correlation effects are minimal in 5$d$ compounds. However, we observed a
bandwidth-controlled transition from a Mott insulator to a metal as we
increased $n$. In addition, the artificially synthesized perovskite SrIrO$_{3}$
showed a very large mass enhancement of about 6, indicating that it was in a
correlated metallic state.

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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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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: eess
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: stat