Abstract
We show that even in dimensions the Hubbard model, when scaled properly, describes nontrivial correlations among fermions. Diagrammatic treatments are found to be substantially simpler than in finite dimensions. The weak-coupling correlation energy is seen to be a good approximation for that in . Recent approximations based on slave-boson techniques are recovered by the exact evaluation of explicit variational wave functions in .
- Received 28 September 1988
DOI:https://doi.org/10.1103/PhysRevLett.62.324
©1989 American Physical Society