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 method. 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 is 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.

4 pages, 4 figures; Final version to appear in Phys. Rev. Lett

References in corpus (4)

• Correlated Fermions in a one-dimensional quasiperiodic potential
• Ground State and Elementary Excitations of the S=1 Kagome Heisenberg Antiferromagnet
• Density Matrix Renormalization Group Study of the S=1/2 Anisotropic Antiferromagnetic Heisenberg Chains with Quasiperiodic Exchange Modulation
• Electronic States in Half-Filled Correlated System with Alternating Potential

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