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The electronic structure of the honeycomb lattice iridates Na2IrO3 andLi2IrO3 has been investigated using resonant inelastic x-ray scattering (RIXS).Crystal-field split d-d excitations are resolved in the high-resolution RIXSspectra. In particular, the splitting due to non-cubic crystal fields, derivedfrom the splitting of j_eff=3/2 states, is much smaller than the typicalspin-orbit energy scale in iridates, validating the applicability of j_effphysics in A2IrO3. We also find excitonic enhancement of the particle-holeexcitation gap around 0.4 eV, indicating that the nearest-neighbor Coulombinteraction could be large. These findings suggest that both Na2IrO3 andLi2IrO3 can be described as spin-orbit Mott insulators, similar to the squarelattice iridate Sr2IrO4.

Crystal field splitting and correlation effect on the electronic structure of A2IrO3