Abstract
An elaborate variational wave function is used for studying superconductivity in the (repulsive) two-dimensional Hubbard model, including both nearest- and next-nearest-neighbor hoppings. A marked asymmetry is found between the “localized” hole-doped region and the more itinerant electron-doped region. Superconductivity with -wave symmetry turns out to be restricted to densities where the Fermi surface crosses the magnetic zone boundary. A concomitant peak in the magnetic structure factor at clearly points to a magnetic mechanism.
- Received 21 November 2008
DOI:https://doi.org/10.1103/PhysRevB.79.100510
©2009 American Physical Society