Models of impurities in valence bond spin chains and ladders

Details Models of impurities in valence bond spin chains and ladders Models of impurities in valence bond spin chains and ladders

1998-03-30

arxiv.org/abs/cond-mat/9803364v1

J. Phys.: Condens. Matter v.10, 6795 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages revtex, 3 figures embedded

Scientific paper

10.1088/0953-8984/10/30/017

We present the class of models of a nonmagnetic impurity in S=1/2 generalized
ladder with an AKLT-type valence bond ground state, and of a S=1/2 impurity in
the S=1 AKLT chain. The ground state in presence of impurity can be found
exactly. Recently studied phenomenon of local enhancement of antiferromagnetic
correlations around the impurity is absent for this family of models.

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