On the multi-reference nature of plutonium oxides: PuO22+, PuO2, PuO3 and PuO2(OH)2

Orbital correlation diagrams for plutonium oxides containing oxo- and hydroxo-ligands.

ORBITAL CORRELATIONS IN SPINLESS HUBBARD CHAIN

We have calculated the orbital correlation of the spinless two orbitals Hubbard chain in the limit of a very strong on-site Coulomb interaction and half-filling. The Hamiltonian is written in the form of pseudospin operators, and the Hilbert space is restricted to those states with only one electron per lattice site. The ground state wave function has been calculated using the density matrix renormalization group method. It has been found that the orbital correlations occur in the chain along the x-, y-, and z-axis and these are in antiferro-orbital states.