In the present paper, the Gutzwiller density functional theory (LDA+G) has been applied to study a bilayer system of LaCoO3 grown along the (111) direction on SrTiO3. The LDA calculations show that there are two nearly flat bands located at the top and bottom of eg bands of Co atoms with the Fermi level crossing the lower one, which is almost half-filled. After including both the spin-orbit coupling and the Coulomb interaction in the LDA+G method, we find that the interplay between spin-orbit coupling and Coulomb interaction stabilizes a very robust ferromagnetic insulator phase with non-zero Chern number, which indicates the possibility to realize quantum anomalous Hall effect in this system.
@article{arxiv.1409.6797,
title = {Interaction-induced quantum anomalous Hall phase in (111) bilayer of LaCoO$_3$},
author = {Yilin Wang and Zhijun Wang and Zhong Fang and Xi Dai},
journal= {arXiv preprint arXiv:1409.6797},
year = {2015}
}