We study theoretically the electronic states in a 5d transition metal oxide Na2IrO3, in which both the spin-orbit interaction and the electron correlation play crucial roles. Tight-binding model analysis together with the fisrt-principles band structure calculation predicts that this material is a layered quantum spin Hall system. Due to the electron correlation, an antiferromagnetic order first develops at the edge, and later inside the bulk at low temperatures.
@article{arxiv.0809.1317,
title = {Quantum spin Hall effect in a transition metal oxide Na2IrO3},
author = {Atsuo Shitade and Hosho Katsura and Jan Kunes and Xiao-Liang Qi and Shou-Cheng Zhang and Naoto Nagaosa},
journal= {arXiv preprint arXiv:0809.1317},
year = {2009}
}