Abstract
Phase diagrams of the two-dimensional one-band Hubbard model are obtained within the two-patch and temperature-cutoff many-patch renormalization group approaches. At small and at van Hove band fillings antiferromagnetism dominates, while with increasing or changing filling antiferromagnetism is replaced by d-wave superconductivity. Near and close to van Hove band fillings the system is unstable towards ferromagnetism. Away from van Hove band fillings this ferromagnetic instability is replaced by a region with dominating triplet p-wave superconducting correlations. The results of the renormalization-group approach are compared with the mean-field results and the results of the T-matrix approximation.
- Received 10 April 2003
DOI:https://doi.org/10.1103/PhysRevB.68.195101
©2003 American Physical Society