title: d-Mott phases in one and two dimensions.
abstract: We use exact diagonalization to determine the spectrum of reduced Hamiltonians based on renormalization group flows to strong coupling. For the half-filled two-leg Hubbard ladder we reproduce the known insulating d-Mott ground state with spin and charge gaps. For the saddle point regions of the two-dimensional Hubbard model near half filling we find a crossover to a similar strong coupling state, which truncates the Fermi surface near the saddle points. At lower scales d-wave superconductivity appears on the remaining Fermi surface.
authors.affiliation: Laboratoire de Physique Théorique, CNRS-UMR 5152, Université Paul Sabatier, F-31062 Toulouse, France.
authors.forename: A
authors.initials: A
authors.lastname: Läuchli
authors.forename: C
authors.initials: C
authors.lastname: Honerkamp
authors.forename: T M
authors.initials: TM
authors.lastname: Rice