Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic structure of ternary palladates and effect of hole doping: A
  valence band photoemission spectroscopic study   We investigate the electronic structure of ternary palladates $A$Pd$_3$O$_4$
($A$ = Sr, Ca) using valence band photoemission spectroscopy and band structure
calculations. Overall width of the valence band and energy positions of various
features in experimental valence band spectra are well captured by band
structure calculations using hybrid functional. Band structure calculations
within local density approximations lead to metallic ground state while the
calculations using hybrid functional provide band gap of 0.25 eV and 0.22 eV
for CaPd$_3$O$_4$ and SrPd$_3$O$_4$ respectively, suggesting moderated to
strong electron correlation strength in these narrow band gap semiconducting
palladates. High resolution spectra reveals negligibly small intensity at Fermi
level for parent compounds while hole doped SrPd$_3$O$_4$ (by 15\% Li
substitution at Sr site) exhibits a Fermi cut-off suggesting metallic character
in contrast to semiconducting transport. These observations reveal the
importance of localization of electrons in case where the Fermi edge falls in
the mobility edge.

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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: physics
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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: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ph