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Ferromagnetism and orbital order in the two-orbital Hubbard model

Kubo, Katsunori 

In order to understand magnetism in systems with an orbital degree of freedom, we investigate spin and orbital states of the two-orbital Hubbard model on a square lattice by using a variational Monte Carlo method. At quarter filling, i.e., the electron number per site is one, the ground state is the perfect ferromagnetic state with antiferro-orbital (AF-orbital) order in the strong Coulomb interaction limit. By decreasing the interaction, we find that the disordered state becomes the ground state.

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