title: Quasiperiodic hubbard chains.
abstract: Low-energy properties of half-filled Fibonacci Hubbard models are studied by weak-coupling renormalization group and density matrix renormalization group methods. In the case of diagonal modulation, weak Coulomb repulsion is irrelevant and the system behaves as a free Fibonacci chain, while for strong Coulomb repulsion the charge sector becomes a Mott insulator and the spin sector behaves as a uniform Heisenberg antiferromagnetic chain. The off-diagonal modulation always drives the charge sector to a Mott insulator and the spin sector to a Fibonacci antiferromagnetic Heisenberg chain.
authors.affiliation: Department of Physics, Faculty of Science, Saitama University, Urawa, Saitama 338-8570, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hida