Quasiperiodic Hubbard chains

Details Quasiperiodic Hubbard chains Quasiperiodic Hubbard chains

2000-09-29

arxiv.org/abs/cond-mat/0009460v2

Phys. Rev. Lett. 86 (2001) 1331

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevLett.86.1331

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.

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