Abstract
What is commonly called the Gutzwiller wave function , an approximate ground state of the single-band Hubbard Hamiltonian, is considered here for -site -electron rings, when the number of doubly occupied sites is small (). For spin correlations in surprisingly close to the exact values at zero bandwidth are found (i.e., those of the antiferromagnetic Heisenberg-model ground state). But the energy is grossly in error. A simple modification of reproduces the exact energy with remarkable accuracy.
- Received 8 March 1982
DOI:https://doi.org/10.1103/PhysRevLett.49.889
©1982 American Physical Society