Exact ground states of generalized Hubbard models

Details Exact ground states of generalized Hubbard models Exact ground states of generalized Hubbard models

1995-03-21

arxiv.org/abs/cond-mat/9503122v1

Physics

Condensed Matter

Revtex, 8 pages

Scientific paper

10.1103/PhysRevLett.75.4298

We present a simple method for the construction of exact ground states of generalized Hubbard models in arbitrary dimensions. This method is used to derive rigorous criteria for the stability of various ground state types, like the $\eta$-pairing state, or N\'eel and ferromagnetic states. Although the approach presented here is much simpler than the ones commonly used, it yields better bounds for the region of stability.

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