The Effective Theory of Hole Doped Spin-1 Chain

Details The Effective Theory of Hole Doped Spin-1 Chain The Effective Theory of Hole Doped Spin-1 Chain

1999-01-22

arxiv.org/abs/cond-mat/9901234v1

Physics

Condensed Matter

Strongly Correlated Electrons

25 pages, 8 figures, Accepted by Phys. Rev. B

Scientific paper

An effective theory for the hole doped spin-1 antiferromagnetic chain is proposed in this paper. The two branches of low energy quasipaticle excitation is obtained by the diagrammic technique. In the large t limit(in which t is the hole hopping term), the lower band is essentially the bound state of one hole and one magnon and the other band is the sigle hole state. We find a critical value of t, $t_c=0.21\Delta_H$(in which $\Delta_H$ is the Haldane gap).For $t>t_c$, with the decrement of t, the mixing of these two bands become stronger and stronger, and at the same time the effective band mass becomes larger and larger. When $t

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