Integrable versus Non-Integrable Spin Chain Impurity Models

Details Integrable versus Non-Integrable Spin Chain Impurity Models Integrable versus Non-Integrable Spin Chain Impurity Models

1993-06-01

arxiv.org/abs/cond-mat/9306003v1

Physics

Condensed Matter

20 pages 11 figures obtainable from authors, REVTEX 3.0

Scientific paper

10.1088/0305-4470/26/23/023

Recent renormalization group studies of impurities in spin-1/2 chains appear to be inconsistent with Bethe ansatz results for a special integrable model. We study this system in more detail around the integrable point in parameter space and argue that this integrable impurity model corresponds to a non-generic multi-critical point. Using previous results on impurities in half-integer spin chains, a consistent renormalization group flow and phase diagram is proposed.

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