Entangled spin-orbital phases in the bilayer Kugel-Khomskii model

Wojciech Brzezicki, Andrzej M. Oleś

We derive the Kugel-Khomskii spin-orbital (SO) model for a bilayer and investigate its phase diagram depending on Hund's exchange $J_H$ and the $e_g$ orbital splitting $E_z$. In th…