Unusual Symmetries in the Kugel-Khomskii Hamiltonian

A. B. Harris, Taner Yildirim, Amnon Aharony +2

The Kugel-Khomskii Hamiltonian for cubic titanates describes spin and orbital superexchange interactions between $d^1$ ions having three-fold degenerate $t_{2g}$ orbitals. Since or…