Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Crystal field splitting and correlation effect on the electronic
  structure of A2IrO3   The electronic structure of the honeycomb lattice iridates Na2IrO3 and
Li2IrO3 has been investigated using resonant inelastic x-ray scattering (RIXS).
Crystal-field split d-d excitations are resolved in the high-resolution RIXS
spectra. In particular, the splitting due to non-cubic crystal fields, derived
from the splitting of j_eff=3/2 states, is much smaller than the typical
spin-orbit energy scale in iridates, validating the applicability of j_eff
physics in A2IrO3. We also find excitonic enhancement of the particle-hole
excitation gap around 0.4 eV, indicating that the nearest-neighbor Coulomb
interaction could be large. These findings suggest that both Na2IrO3 and
Li2IrO3 can be described as spin-orbit Mott insulators, similar to the square
lattice iridate Sr2IrO4.

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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
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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: q-bio