Effects of edges in spin-1/2 bond-alternating Heisenberg chains: Matrix-product variational approach

Details Effects of edges in spin-1/2 bond-alternating Heisenberg chains: Matrix-product variational approach Effects of edges in spin-1/2 bond-alternating Heisenberg chains: Matrix-product variational approach

2004-12-15

arxiv.org/abs/cond-mat/0412390v1

Physics

Condensed Matter

Strongly Correlated Electrons

Phys. Lett. A 334, No. 2-3, 220 (2004)

Scientific paper

10.1016/j.physleta.2004.10.079

We make a matrix-product variational approach to spin-1/2 ferromagnetic-antiferromagnetic bond-alternating chains with anisotropy on their ferromagnetic bonds, especially under the open boundary condition. The rich phase diagram containing the Haldane, large-D, and two types of Neel phases is well reproduced with only two variational parameters. The on-bond anisotropy has a significant effect on the ferromagnetic coupling between neighboring spins and induces novel edge states peculiar to spin-1/2 chains.

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