Ferromagnetism in multiband Hubbard models: From weak to strong Coulomb repulsion
- 1 August 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 54 (6) , 4056-4067
- https://doi.org/10.1103/physrevb.54.4056
Abstract
We propose a mechanism which can lead to ferromagnetism in Hubbard models containing triangles with different on-site energies. It is based on an effective Hamiltonian that we derive in the strong coupling limit. Considering a one-dimensional realization of the model, we show that in the quarter-filled, insulating case the ground state is actually ferromagnetic in a very large parameter range going from Tasaki’s flatband limit to the strong coupling limit of the effective Hamiltonian. This result has been obtained using a variety of analytical and numerical techniques. Finally, the same results are shown to apply away from quarter-filling, in the metallic case. © 1996 The American Physical Society.Keywords
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