Exchange interactions in $d^5$ Kitaev materials: From Na${}_2$IrO${}_3$ to $\alpha$-RuCl${}_3$

Huimei Liu, Jiri Chaloupka, Giniyat Khaliullin

We present an analytical study of the exchange interactions between pseudospin one-half $d^5$ ions in honeycomb lattices with edge-shared octahedra. Various exchange channels inv…