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

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 Néel phases is well...

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Bibliographic Details
Published in:Physics letters. A 2005-01, Vol.334 (2), p.220-225
Main Authors: Funase, Kei-ichi, Yamamoto, Shoji
Format: Article
Language:English
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Summary: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 Néel 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.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2004.10.079