Ground-state properties of the two-dimensional Hubbard model
- 1 October 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 44 (13) , 7151-7154
- https://doi.org/10.1103/physrevb.44.7151
Abstract
Using all appropriate symmetries for a two-dimensional square system, we have been able to diagonalize exactly the Hubbard Hamiltonian on the 4×4 and 18-site lattices. We calculate the ground-state energies, hole-hole interactions, and various correlation functions as functions of the Coulomb repulsion U and band filling, and compare the Hubbard-model results with those obtained from the t-J and strong-coupling models.Keywords
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