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.
使用言語 |
: | English |
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掲載資料名 |
: | |
巻 |
: | 150 |
号 |
: | 4 |
ページ数 |
: | p.042101_1 - 042101_4 |
発行年月 |
: | 2009/03 |
発表会議名 |
: | 25th International Conference on Low Temperature Physics (LT-25) |
開催年月 |
: | 2008/08 |
開催都市 |
: | Amsterdam |
開催国 |
: | Netherlands |
キーワード |
: | no keyword |
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