Ghost spins and novel quantum critical behavior in a spin chain with local bond-deformation

Details Ghost spins and novel quantum critical behavior in a spin chain with local bond-deformation Ghost spins and novel quantum critical behavior in a spin chain with local bond-deformation

1998-08-07

arxiv.org/abs/cond-mat/9808079v1

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages revtex, no figure

Scientific paper

10.1103/PhysRevB.60.6594

We study the boundary impurity-induced critical behavior in an integrable SU(2)-invariant model consisting of an open Heisenberg chain of arbitrary spin-$S$ (Takhatajian-Babujian model) interacting with an impurity of spin $\vec{S'}$ located at one of the boundaries. For $S=1/2$ or $S'=1/2$, the impurity interaction has a very simple form $J\vec{S}_1\cdot\vec{S'}$ which describes the deformed boundary bond between the impurity $\vec{S'}$ and the first bulk spin $\vec{S}_1$ with an arbitrary strength $J$. With a weak coupling $0S'$ and $S

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