Weak-Coupling Approach to Hole-Doped S=1 Haldane Systems

Details Weak-Coupling Approach to Hole-Doped S=1 Haldane Systems Weak-Coupling Approach to Hole-Doped S=1 Haldane Systems

1995-06-22

arxiv.org/abs/cond-mat/9506118v1

Physics

Condensed Matter

4 pages, RevTex, 1 postscript figure (uuencoded and compressed), to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.52.6189

As a weak-coupling analogue of hole-doped $S=1$ Haldane systems, we study two models for coupled chains via Hund coupling; coupled Hubbard chains, and a Hubbard chain coupled with an $S=1/2$ Heisenberg chain. The fixed point properties of these models are investigated by using bosonization and renormalization group methods. The effect of randomness on these fixed points is also studied. It is found that the presence of the disorder parameter inherent in the Haldane state in the former model suppresses the Anderson localization for weak randomness, and stabilizes the Tomonaga-Luttinger liquid state with the spin gap.

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