Weak-Coupling Approach to Hole-Doped S=1 Haldane Systems
Condensed Matter
2009-10-28 v1
Abstract
As a weak-coupling analogue of hole-doped Haldane systems, we study two models for coupled chains via Hund coupling; coupled Hubbard chains, and a Hubbard chain coupled with an 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.
Keywords
Cite
@article{arxiv.cond-mat/9506118,
title = {Weak-Coupling Approach to Hole-Doped S=1 Haldane Systems},
author = {S. Fujimoto and N. Kawakami},
journal= {arXiv preprint arXiv:cond-mat/9506118},
year = {2009}
}
Comments
4 pages, RevTex, 1 postscript figure (uuencoded and compressed), to appear in Phys. Rev. B