Generic spin model for the honeycomb iridates beyond the Kitaev limit.

@article{Rau2014GenericSM,
  title={Generic spin model for the honeycomb iridates beyond the Kitaev limit.},
  author={Jeffrey G. Rau and Eric Kin-Ho Lee and Hae Young Kee},
  journal={Physical review letters},
  year={2014},
  volume={112 7},
  pages={
          077204
        }
}
Recently, realizations of Kitaev physics have been sought in the A2IrO3 family of honeycomb iridates, originating from oxygen-mediated exchange through edge-shared octahedra. However, for the jeff=1/2 Mott insulator in these materials, exchange from direct d-orbital overlap is relevant, and it was proposed that a Heisenberg term should be added to the Kitaev model. Here, we provide the generic nearest-neighbor spin Hamiltonian when both oxygen-mediated and direct overlap are present, containing… 

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