1210.2290 (Satoshi Okamoto)

Doped Mott insulators in (111) bilayers of perovskite transition-metal
oxides with the strong spin-orbit coupling    [PDF]

Satoshi Okamoto

We study the electronic properties of Mott insulators realized in (111) bilayers of perovskite transition-metal oxides. The low-energy effective Hamiltonians for such Mott insulators are derived in the presence of the strong spin-orbit coupling. These models are characterized by the antiferromagnetic or ferromagnetic Heisenberg interaction depending on the $d$ orbital occupancy and the antiferromagnetic Kitaev interaction. From exact diagonalization analyses on finite clusters, Kitaev spin liquid phases are shown to be confined in narrow parameter regimes. Slave-boson mean-field analyses indicate the possibility of non-trivial superconducting states induced by carrier doping into the Mott-insulating parent systems. Possible experimental realizations are also discussed.

View original: http://arxiv.org/abs/1210.2290