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Effects of edges in spin-1/2 bond-alternating Heisenberg chains: Matrix-product variational approach | | Kei-ichi Funase
; Shoji Yamamoto
; | | Date: |
15 Dec 2004 | | Subject: | Strongly Correlated Electrons; Statistical Mechanics | cond-mat.str-el cond-mat.stat-mech | | Abstract: | 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. | | Source: | arXiv, cond-mat/0412390 | | Services: | Forum | Review | PDF | Favorites | |
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