2003/09/30 by Andreas M. Läuchli, A. Laeuchli, Carsten Honerkamp +2
Materials Science · Physics and Astronomy · #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #Quantum many-body systems #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.92.037006
published as Phys. Rev. Lett. 92, 037006 (2004) · 4 pages, 4 figures, published version, journal reference added
openalex publication_date 2004/01/23 · arxiv created 2004/01/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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.