Superconductivity and antiferromagnetism in the two-dimensional Hubbard model: A variational study
D. Eichenberger, D. Baeriswyl
DOI 10.1103/PhysRevB.76.180504 · Physical Review B
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Abstract
A variational ground state of the repulsive Hubbard model on a square lattice is investigated numerically for an intermediate coupling strength (U=8t) and for moderate sizes (from 6×6 to 10×10). Our ansatz is superior to other widely used variational wave functions. The results for order parameters and correlation functions provide insight into the antiferromagnetic state at half-filling as well as strong evidence for a superconducting phase away from half-filling.
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