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Landau Expansion for the Kugel-Khomskii Hamiltonian
A. B. Harris, Amnon Aharony, O. Entin-Wohlman +2
The Kugel-Khomskii (KK) Hamiltonian for the titanates describes spin and orbital superexchange interactions between ions in an ideal perovskite structure in which the three $…
Hidden Symmetries and their Consequences in Cubic Perovskites
A. B. Harris, T. Yildirim, A. Aharony +2
The five-band Hubbard model for a band with one electron per site is a model which has very interesting properties when the relevant ions are located at sites with high (e. g.…
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 ions having three-fold degenerate orbitals. Since or…
Lattice Dynamics of Solid Cubane within the Quasi-Harmonic Approximation
Taner Yildirim
Solid cubane, which is composed of weakly interacting cubic molecules, exhibits many unusual and interesting properties, such as a very large thermal expansion and a first-order ph…
Quantum Dynamics of a Hydrogen Molecule Confined in a Cylindrical Potential
Taner Yildirim, A. Brooks Harris
We study the coupled rotation-vibration levels of a hydrogen molecule in a confining potential with cylindrical symmetry. We include the coupling between rotations and translations…