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Ghost spins and novel quantum critical behavior in a spin chain with local bond-deformation | | Jian-Hui Dai
; Yupeng Wang
; U. Eckern
; | | Date: |
7 Aug 1998 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | 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 $Jvec{S}_1cdotvec{S’}$ 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 | | Source: | arXiv, cond-mat/9808079 | | Services: | Forum | Review | PDF | Favorites | |
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