Exact solutions of frustrated ordinary and chiral eight-site Hubbard models
- Department of Physics, University of California, Berkeley, CA (USA) Materials Science Division, Lawrence Berkeley Laboratory, Berkeley, CA (USA)
- Department of Physics, University of California, Berkeley, CA (USA)
This contribution addresses the question of whether or not the ground state of a frustrated spin-1/2 Heisenberg model can be smoothly related to the ground state of a simple tight-binding model at half-filling in an appropriately chosen magnetic field. This continuity is considered explicitly for an eight-site square-lattice Hubbard model with nearest- and next-nearest-neighbor hopping, which approaches a frustrated Heisenberg model with nearest- and next-nearest-neighbor antiferromagnetic exchange coupling in the limit of large Hubbard {ital U}. In addition, a counterexample to the widely held belief that the half-filled band of the ordinary Hubbard model is nonmagnetic has been found in the regime where the hopping parameters and Hubbard interaction are all the same order of magnitude.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5265284
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 44:4; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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