Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First-Principles Calculations of the Near-Edge Optical Properties of
  \b{eta}-Ga2O3   We use first-principles calculations based on many-body perturbation theory
to investigate the near-edge electronic and optical properties of
\b{eta}-Ga2O3. The fundamental band gap is indirect, but the minimum direct gap
is only 29 meV higher in energy, which explains the strong near-edge
absorption. Our calculations verify the anisotropy of the absorption onset and
explain the range (4.4-5.0 eV) of experimentally reported band-gap values. Our
results for the radiative recombination rate indicate that intrinsic light
emission in the deep-UV range is possible in this indirect-gap semiconductor at
high excitation. Our work demonstrates the applicability of \b{eta}-Ga2O3 for
deep-UV detection and emission.

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The categories of this paper are: dg-ga
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The categories of this paper are: cs
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: stat
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg