Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-05-28
Phys. Rev. B 80, 180409(R) (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 figures
Scientific paper
10.1103/PhysRevB.80.180409
We present a novel approach to study the ground state and elementary excitations in compounds where spins and orbitals are entangled by on-site relativistic spin-orbit interaction. The appropriate degrees of freedom are localized states with an effective angular momentum J. We generalize J to arbitrary large values while maintaining the delicate spin-orbital entanglement. After projecting the inter-site exchange interaction to the manifold of effective spins, a systematic 1/J expansion of the effective Hamiltonian is realized using the Holstein-Primakoff transformation. Applications to representative compounds Sr2IrO4 and particularly vanadium spinels AV2O4 are discussed.
Chern Gia-Wei
Perkins Natalia
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