On the parafermionic scattering of an integrable Heisenberg model with impurity

Details On the parafermionic scattering of an integrable Heisenberg model with impurity On the parafermionic scattering of an integrable Heisenberg model with impurity

1994-02-21

arxiv.org/abs/cond-mat/9402083v1

Physics

Condensed Matter

14 pages, UFSCARF-TH-94-4

Scientific paper

10.1016/0550-3213(94)90025-6

We have studied the massive parafermionic sector of an integrable spin-$s$ chain with an impurity of spin-$s^{'}$ in presence of a magnetic field. The effect of the impurity is encoded in a computable parafermionic impurity scattering amplitude and its contribution to the finite size properties of the free energy is discussed. As an example we compute the non-integer degeneracy of the ground state. For the simplest model of $s=1$ and $s^{'}=1/2$, its interpretation in terms of conformally invariant boundary conditions is presented.

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