Spin-Orbital Locking, Emergent Pseudo-Spin, and Magnetic order in Na2IrO3

Details Spin-Orbital Locking, Emergent Pseudo-Spin, and Magnetic order in Na2IrO3 Spin-Orbital Locking, Emergent Pseudo-Spin, and Magnetic order in Na2IrO3

2011-08-08

arxiv.org/abs/1108.1806v2

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages (Including Supplementary Material) (Minor modifications made and references added)

Scientific paper

The nature of magnetic order in the honeycomb lattice Iridate Na2IrO3 is explored by considering trigonal crystal field effect and spin-orbit coupling. An effective Hamiltonian is derived in terms of an emergent pseudo-spin-1/2, resulting from a spin-orbital locking, which is different from j_eff = 1/2 that is obtained when the spin-orbit coupling dominates. The resulting Hamiltonian is anisotropic and frustrated. Mean field theory suggests a ground state with 4-sublattice zig-zag magnetic order in the relevant parameter regime, in conformity with experiments. Various properties of the phase, the spin-wave spectrum and experimental consequences are discussed. This approach contrasts with the recent proposals of topological insulator or a Heisenberg-Kitaev system for this material, which fail to explain the observed magnetic properties.

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