Quantum spin Hall effect in a transition metal oxide Na2IrO3
  We study theoretically the electronic states in a $5d$ transition metal oxide Na$_2$IrO$_3$, 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. 
Atsuo Shitade, Hosho Katsura, Jan Kunes, Xiao-Liang Qi, Shou-Cheng   Zhang, and Naoto Nagaosa